Misc tweaks to billing interface and list infrastructure.

Misc tweaks to billing interface and list infrastructure.

Fix mislabeled column for title in payments history interface.
Support preservation of treecell properties, and style specific columns in the bills interface instead of whole rows.
Support immediate fleshing of rows in lists, and do such in the bills interface since the various tallies in that interface depend on the data being fully retrieved.

TODO:

Revisit the preservation of treecell properties.  May be some unintended consequences to not blowing away and re-creating the treecell elements when refreshing rows in a list.  Hrmm, perhaps a field being unset but its previous value still being rendered.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@15218 dcc99617-32d9-48b4-a31d-7c20da2025e4