K 10
svn:author
V 5
dougb
K 8
svn:date
V 27
2011-05-09T19:40:36.423720Z
K 7
svn:log
V 429
In shuffling around the updating of +REQUIRED_BY I forgot to delete
empty grep_deps files. [1]

While I'm looking at unlink'ing files, bring some sanity to the various
places that it's done which haven't been reviewed in a while.
* Fix the pm_unlink* functions to use the builtin test
* Only/always call the function when we're not sure if the file exists
* Just use /bin/unlink when we're sure it does

Submitted by:	olgeni [1]

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