* Add an action to add create an initial balance transaction, from an accounting period.
It is added on accounting period not to be in allowed content types from accounting module, because we only need to create one accounting period manually.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34986 20353a03-c40f-0410-a6d1-a30d3c3de9de