Update drupal6 package to 6.28.

Drupal 6.28, 2013-01-16
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- Fixed security issues (multiple vulnerabilities), see SA-CORE-2013-001.
Update drupal7 package to 7.19.

Drupal 7.19, 2013-01-16
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2013-001.
Note update of Drupal packages:

	www/drupal6	6.28
	www/drupal7	7.19
+ bdftopcf-1.0.4, beforelight-1.0.5, ico-1.0.4, libdrm-2.4.41, samba-4.0.1,
  showfont-1.0.4 [wip], sudo-1.8.6p4, xcalc-1.0.5, xvidtune-1.0.3.
Add three meta-packages, bulk-small, bulk-medium, and bulk-large.
These are lists of packages that can be used to do restricted bulk
builds on small/slow machines without having to spend time researching
which packages to include.

They are supposed to take roughly 1 hour, 8 hours, and 24 hours on the
arbitrarily chosen yardstick of my build machine; my hope is that this
translates into only moderately crazy lengths of time for slow
platforms where a full bulk build takes 6-8 months.

The lists will doubtless need some adjustment to meet this time
budget. Also, please take any discussion of which packages are and are
not included to tech-pkg or pkgsrc-users. The intent is to provide a
maximally useful set of a given size, but that's naturally difficult
to define.
There are altogether too many packages whose PKGNAME and PKGDIR don't
match.

These now pbulk-scan properly.