[Users] GetComponents

[Roland Haas]

Hello all,

I had played around with converting our codebase to the new directory 
layout (so far it compiles without problems) and found it useful to add 
darcs support to GetComponents. For this I copied the git routines and 
did a s/git/darcs/ (almost literally just that).

Also slightly changed how git, darcs and hg create links by using Perl's 
File::Spec->abs2rel function to create relative paths. This avoids the 
hard-coded assumption that git-repos is two directory levels above the 
target.

Finally I added close($output) statements to run_command which seem to 
be necessary to catch the return value of 'which'. Otherwise 
GetComponents does not seem to detect that there is no darcs eg. on Ranger.

If these seem like good things to have, would it be possible to add them 
to GetComponents?

Yours,
Roland
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