worked on treeview
wip
wip
New tree structure created
Added some type checking and asserts
Now returns default QSize if it can't find thumbnail
Changed print to __builtin__.print
Tables now sort
Fixed segmentation faults by commenting layoutAboutToBeChanged.emit()
_get_row_id takes a qtindex now
wip
Fixed segfaults?
Removed cache
Fixed parameters passed to _set_data from setData
Merge branch 'nametree' into merge_nametree

Conflicts:
	guitool/api_table_model.py
	guitool/api_thumb_delegate.py
Implemented get_header_data for tables
Added comments
Commented out a print statement