support for triggers

many of the post-install scripts can be done once after all packages are installed rather than run it for each package in post-install. Specially after installing fonts updating the fontcache is painfully slow. Other candidates for triggers are kernel modules that needs depmod.

(from redmine: issue id 45, created on 2009-06-22, closed on 2009-08-19)

• Changesets:
  • Revision 36b5cee9 by Timo Teräs on 2009-08-12T16:17:46Z:

db, pkg: separate structure for fields of installed packages

this makes the database package entry smaller, and we propbably
get more fields to installed_package later too. this cleans up
the way scripts are stored and is a preparation for supporting
triggers. some parsing for trigger meta-data. ref #45.

• Revision b71606db by Timo Teräs on 2009-08-13T07:45:48Z:

info: clean ups, print triggers (ref #45)

• Revision 279513bf by Timo Teräs on 2009-08-13T11:10:30Z:

db: implement triggers (fixes #45)