[jhc] darcs patch: add --dependencies option to output file dependencies.

Hi John, Part of this is very hokey, since I had trouble tracking which files led to which libraries (your data types are a bit confusing). I'm also flexible on the option naming and details (e.g. is it important to be able to handle filenames with embedded newlines?). The idea, obviously, is to enable franchise to know when to rebuild. It could also be used with Makefiles, so we might also prefer a more make-friendly output. Oh, and it doesn't track dependencies on included files. To do that, we'd need help from the C preprocessor, which would be nice to add--but not critical. David Fri Sep 4 10:45:18 EDT 2009 David Roundy * add --dependencies option to output file dependencies.