add texclear script to make makefile portable

Sem_paper/texclear

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# Clears the build files of a LaTeX/XeLaTeX build.
+# I have vim run this file whenever I exit a .tex file.
+
+case "$1" in
+	*.tex)
+	file=$(readlink -f "$1")
+	dir=$(dirname "$file")
+	base="${file%.*}"
+	find "$dir"  -maxdepth 1 -type f -regextype gnu-awk -regex "^$base\\.(4tc|xref|tmp|pyc|pyo|fls|vrb|fdb_latexmk|bak|swp|aux|log|synctex\\(busy\\)|lof|lot|maf|idx|mtc|mtc0|nav|out|snm|toc|bcf|run\\.xml|synctex\\.gz|blg|bbl)" -delete ;;
+	*) printf "Give .tex file as argument.\\n" ;;
+esac