done a little vimrc clean-up

* removed redundant (and anyway already commented out) vundle code
    as I use vimplug now
* added vim-gitgutter plugin
* added pdf viewer plugin with on-the-fly pdf-->text conversion
* added deoplete plugin
* added noscrollbind - prevents synchronized scrolling of split windows

vimrc

@@ -1,76 +1,11 @@
 set nocompatible
 
 filetype off                  "required
-""set rtp+=~/.vim/bundle/Vundle.vim 
 
-""call vundle#begin()
-" alternatively, pass a path where Vundle should install plugins
-"call vundle#begin('~/some/path/here')
+"filetype plugin on            " required
 
-" let Vundle manage Vundle, required
-""Plugin 'VundleVim/Vundle.vim'
-
-" The following are examples of different formats supported.
-" Keep Plugin commands between vundle#begin/end.
-" plugin on GitHub repo
-
-"myplugins
-"Plugin 'valloric/youcompleteme'
-""Plugin 'shougo/neocomplete.vim'
-
-""call vundle#end()
-filetype plugin on            " required
-" To ignore plugin indent changes, instead use:
-"filetype plugin on
-"
-" Brief help
-" :PluginList       - lists configured plugins
-" :PluginInstall    - installs plugins; append `!` to update or just :PluginUpdate
-" :PluginSearch foo - searches for foo; append `!` to refresh local cache
-" :PluginClean      - confirms removal of unused plugins; append `!` to auto-approve removal
-"
-" see :h vundle for more details or wiki for FAQ
-" Put your non-Plugin stuff after this line
-
-" Disable AutoComplPop.
-let g:acp_enableAtStartup = 0
-" Use neocomplete.
-let g:neocomplete#enable_at_startup = 1
-" Use smartcase.
-let g:neocomplete#enable_smart_case = 1
-" Set minimum syntax keyword length.
-let g:neocomplete#sources#syntax#min_keyword_length = 3
-
-" Define dictionary.
-let g:neocomplete#sources#dictionary#dictionaries = {
-    \ 'default' : '',
-    \ 'vimshell' : $HOME.'/.vimshell_hist',
-    \ 'scheme' : $HOME.'/.gosh_completions'
-        \ }
-
-" Define keyword.
-if !exists('g:neocomplete#keyword_patterns')
-    let g:neocomplete#keyword_patterns = {}
-endif
-let g:neocomplete#keyword_patterns['default'] = '\h\w*'
-
-" Recommended key-mappings.
-" <CR>: close popup and save indent.
-inoremap <silent> <CR> <C-r>=<SID>my_cr_function()<CR>
-function! s:my_cr_function()
-  return (pumvisible() ? "\<C-y>" : "" ) . "\<CR>"
-  " For no inserting <CR> key.
-  "return pumvisible() ? "\<C-y>" : "\<CR>"
-endfunction
-" <TAB>: completion.
 inoremap <expr><TAB>  pumvisible() ? "\<C-n>" : "\<TAB>"
 
-" Close popup by <Space>. NO, this makes it slow af to type
-"inoremap <expr><Space> pumvisible() ? "\<C-y>" : "\<Space>"
-
-" AutoComplPop like behavior.
-let g:neocomplete#enable_auto_select = 0
-
 " Enable omni completion.
 autocmd FileType css setlocal omnifunc=csscomplete#CompleteCSS
 autocmd FileType html,markdown setlocal omnifunc=htmlcomplete#CompleteTags
@@ -83,7 +18,6 @@ if !exists('g:neocomplete#sources#omni#input_patterns')
   let g:neocomplete#sources#omni#input_patterns = {}
 endif
 
-""""""""""""""""""""""""""""""""""""
 
 if empty(glob('~/.vim/autoload/plug.vim'))
   silent !curl -fLo ~/.vim/autoload/plug.vim --create-dirs
@@ -93,14 +27,25 @@ endif
 
 call plug#begin()
 Plug 'drewtempelmeyer/palenight.vim'
+Plug 'https://github.com/suan/vim-instant-markdown', {'for': 'markdown'}
 Plug 'https://tpope.io/vim/surround.git'
 Plug 'https://github.com/tpope/vim-repeat.git'
 Plug 'https://github.com/tpope/vim-fugitive.git'
-Plug 'https://github.com/suan/vim-instant-markdown', {'for': 'markdown'}
-"Plug 'plasticboy/vim-markdown', {'for': 'markdown'}
+Plug 'airblade/vim-gitgutter'
+Plug 'rhysd/open-pdf.vim'
+"Plug 'voldikss/vim-mma'
+Plug 'roxma/nvim-yarp'
+Plug 'roxma/vim-hug-neovim-rpc'
+Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
 call plug#end()
 
-"let g:vim_markdown_new_list_item_indent
+let g:gitgutter_terminal_reports_focus=0
+"let g:gitgutter_async = 0
+
+let g:pdf_convert_on_edit = 1
+let g:pdf_convert_on_read = 1
+
+let g:deoplete#enable_at_startup = 1
 
 " vim-instant-markdown options
 let g:instant_markdown_allow_unsafe_content = 1
@@ -109,7 +54,6 @@ let g:instant_markdown_browser = "chromium-browser --incognito"
 let g:instant_markdown_autoscroll = 1
 let g:instant_markdown_autostart = 1
 
-""""""""""""""""""""""""""""""""""""
 
 " change cursor shape for different editing modes, neovim does this by default
 if !has('nvim')
@@ -179,9 +123,9 @@ augroup vimrc
   au BufWinEnter * if &fdm == 'indent' | setlocal foldmethod=manual | endif
 augroup END
 
-" autosave and load views
-au BufWinLeave ?* mkview
-au BufWinEnter ?* silent loadview
+""" autosave and load views
+""au BufWinLeave ?* mkview
+""au BufWinEnter ?* silent loadview
 
 au FileType xml setlocal shiftwidth=2 tabstop=2
 
@@ -229,8 +173,8 @@ set autoindent
 set backspace=2
 
 set nolist                    " show/hide tabs and EOL chars (hidden characters)
-set number                    " show/hide line numbers (nu/nonu)
-set relativenumber             " use relative number
+"set number                    " show/hide line numbers (nu/nonu)
+"set relativenumber             " use relative number
 set confirm                    " ask confirmation like save before quit.
 set wildmenu                   " Tab completion menu when using command mode
 set scrolloff=5               " scroll offset, min lines above/below cursor
@@ -249,6 +193,7 @@ set nofoldenable
 
 set encoding=utf-8            " important for powerline besides others
 set smartcase                 " override 'ignorecase' when pattern has upper case characters
+set noscrollbind
 
 
 vmap gb :<C-U>!git blame % -L<C-R>=line("'<") <CR>,<C-R>=line("'>") <CR><CR>