misc: add text editor syntax highlighting
implement feedback from review
rose *-run: process file install target names.

File install target names in section headers can now contain environment
variable syntax.

This fixes metomi/rose#385.
misc: rephrase
Merge pull request #386 from matthewrmshin/385.rose-run-file-install-target-env-syntax

rose *-run: process file install target names.
Merge pull request #375 from benfitzpatrick/misc.text-editor-syntax-high

rose miscellany: add gedit, vim syntax highlighting