Show distribution notes on ticket display and modify [rt.cpan.org #79499]

This gives distribution authors more visibility for their notes.

Signed-off-by: Thomas Sibley <trs@bestpractical.com>
Display alternate bug tracker info for a distribution, if available [rt.cpan.org #79499]

This patch adds support for displaying the information added by cpan2rt in
rt.cpan.org ticket #80020.

Whilst we don't prevent creation of tickets in a queue with an external bug
tracker set, we strongly suggest that they might want to look at the
alternative tracking solution indicated.  Should this be unavailable, this
still enables creation of tickets within rt.cpan.org as a last resort.

This work has been sponsored by Shadowcat Systems.

[TRS: I simplified the CSS handling for RT 4.]

Signed-off-by: Thomas Sibley <trs@bestpractical.com>
Merge branch 'alternate-bugtracker' into rt4