patron.properties: Property name tweak (s/spwan/spawn/), new properties for new label...

patron.properties: Property name tweak (s/spwan/spawn/), new properties for new labels and columns in Members Group interface.

info_group.js, info_group.xul: split out the javascript from info_group.xul, refactored it, and added columns for circulation
counts and balance owed, and added labels to sum those across group members.

util.js, tweaked patron.util.retrieve_fleshed_au_via_id so that the 3rd parameter is an optional request callback to make the
function asynchronous

summary.js, added a sort_type to the balance owed column in the patron summary group tab panel

git-svn-id: svn://svn.open-ils.org/ILS/trunk@15189 dcc99617-32d9-48b4-a31d-7c20da2025e4