some new GNATS reports are available

[Mark Linimon]

I've been doing some work to convert some of our weekly email reports to
HTML form.  I have not yet done the work to convert them to .cgi form;
consider these to be prototypes so that we can figure out if they are
useful.  Currently I am generating them once a day.

They are located at http://people.freebsd.org/~linimon/studies/prs/.

In order, they are:

 - New PRs in the last day, week, and month;

 - PRs in the feedback state which may be stale;

 - PRs recommended for committer evaluation by the bugbusting team;

 - PRs sorted by tag (warning: quite large);

 - PRs which may have already been commited.

All but the "new PRs" and "already been committed" reports alredady
exist in email form.

The "new PRs" reports are self-explanatory.

For "staleness" I am using "in feedback state for 2 months".  The idea
is to try to find PRs in which we asked for feedback and never got any.
It will probably include false positives.

The "recommended" list is generated from a static file that I maintain,
and which people may add suggestions to.  The idea is that we can flag
a small subset of PRs to point committers to.

The "sorted by tag" report is a proof-of-concept; it is clear to me that
without the ability to browse by single tag, the page is simply too large.

The "already been committed" report looks for the magic string "dfilter@
FreeBSD.org", which is the From address of email generated by our CVS
scripts if a reference to a PR is found in the commit message.  In some
cases these PRs indicate that an MFC may be needed; in others, the MFC
may have already happened (or is not possible for some reason) and thus
the PR can be closed.

This is all work-in-progress, intended to generate discussion.  Feedback
welcome.

mcl