* gnu/services/dmd.scm (%default-imported-modules, %default-modules):
New variables.
* gnu/services/dmd.scm (<dmd-service>)[modules, imported-modules]: New
field.
* gnu/services/dmd.scm (dmd-service-file-name, dmd-service-file): New
procedures.
(dmd-configuration-file)[modules]: Compute based on the
'imported-modules' field of SERVICES.
(dmd-configuration-file): Remove 'use-modules' form. Use
'dmd-service-file', and call 'primitive-load' on each file.
* doc/guix.texi (dmd Services): Document the new fields.
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