Add infrastructure for calculating bug heat

database/replication/Makefile (+3/-1)
database/replication/helpers.py (+20/-1)
database/replication/initialize.py (+2/-1)
database/replication/sync.py (+26/-0)
database/sampledata/current-dev.sql (+2/-2)
database/sampledata/current.sql (+2/-2)
database/schema/README (+1/-131)
database/schema/comments.sql (+2/-0)
database/schema/patch-2207-19-1.sql (+35/-0)
database/schema/patch-2207-20-0.sql (+13/-0)
database/schema/patch-2207-21-0.sql (+8/-0)
database/schema/patch-2207-24-0.sql (+20/-0)
database/schema/security.cfg (+8/-0)
database/schema/security.py (+3/-0)
lib/canonical/launchpad/scripts/garbo.py (+63/-0)
lib/lp/bugs/configure.zcml (+4/-2)
lib/lp/bugs/doc/bug-heat.txt (+54/-0)
lib/lp/bugs/interfaces/bug.py (+20/-0)
lib/lp/bugs/model/bug.py (+15/-1)
lib/lp/bugs/scripts/bugheat.py (+75/-0)
lib/lp/bugs/scripts/tests/test_bugheat.py (+183/-0)
lib/lp/bugs/tests/test_doc.py (+6/-0)
lib/lp/code/browser/codereviewvote.py (+11/-7)
lib/lp/code/errors.py (+5/-0)
lib/lp/code/interfaces/codereviewvote.py (+35/-1)
lib/lp/code/mail/tests/test_codehandler.py (+1/-1)
lib/lp/code/model/codereviewvote.py (+36/-13)
lib/lp/code/model/tests/test_branchjob.py (+9/-3)
lib/lp/code/model/tests/test_codereviewvote.py (+81/-6)
lib/lp/code/stories/branches/xx-branchmergeproposals.txt (+15/-10)
lib/lp/soyuz/interfaces/buildqueue.py (+18/-5)
lib/lp/soyuz/model/build.py (+2/-1)
lib/lp/soyuz/model/buildqueue.py (+3/-0)
lib/lp/soyuz/tests/test_buildqueue.py (+47/-0)
lib/lp/testing/__init__.py (+4/-1)
scripts/librarian-report.py (+1/-1)