Initial checkin of Ptree Change List
fixed 1. the count of results does not update currently by ajax code, but not the 'x of y selected' part; 2. when there is 0 results initially, the ajax update does not update currently;
make fixed column width configurable; make ptree change list update interval configurable; move django.core.context_processors.request into ptree's default settings
Fixed: add plain text hint to cell contents in ptree change list
ptree_change_list: add user to FakeRequest
ptree change list:fixed results keeps adding issue; add a blank space in title
PTree Change List: 1. fixed the padding of cells; 2. use yellow background to indicate changed cells
PTree: only update cells which changes
PTree Change List: fade out for changed cell color
PTree Change List: add the missing jquery.animate-colors plugin
PTree Change List: if a cell with <input> control is edited, it would be marked with a pencil icon, and would not be updated
PTree Change List: make column width be the max of PTREE_CHANGE_LIST_COLUMN_MIN_WIDTH in settings and table width/column nums
integrated admin enhancements
small change?