Bugzilla::Comment, $bug->longdescs becomes $bug->comments

[Max Kanat-Alexander]

	I just checked in a Bugzilla::Comment object--thanks to James Robson
for the first nine revisions of the patch (which was most or much of
work, really).

	Bugzilla::Bug::GetComments no longer exists. $bug->longdescs has become
$bug->comments, and it can limit its return value by date, and sort its
return value in various ways.

	-Max
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