Remove 'transaction_' prefix.

Handle gap_list parameter.
Use the new centralized rounding method.
Use where_expression instead of my hack.
Support multi gap selection.
Better account sorting to support non-integer id (I suppose it is the work of Fabien).
Attempt to include sumarized line of same level accounts are commented.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@6698 20353a03-c40f-0410-a6d1-a30d3c3de9de