Merged from trunk.
Conference reports bug fixes. Browse conference attendees added.

Partner Edit - Finance Details bug fixes.

Migration fixes added.
Merged from trunk.
Conversion added for tables a_budget, a_budget_revision and a_budget_period.
Merged from trunk.
Test fixed.
merge from Branch 'lp:~peter-simpson/openpetraorg/dev_0002510_conference_report_units'