2.5 - Assorted View2D related fixes

2.5 - Assorted View2D related fixes

IPO Editor Fixes:
* Grid now draws correct. Fixed typo in gridline calculations preventing drawing from occurring. Also, set the right arguments to the appropriate View2D calls.
* Limited Ton's cur<->mask mapping 'hack' to Outliner only, as it was causing problems with the drawing of the grid. Perhaps there's still some faulty code in curRect_validate that should be changed instead...
* Horizontal scroller draws frames now by default. However, the values are still offset a bit, so will need further investigation.

Outliner Fixes:
* Fixed overlapping text problem with RNA-path and menus. Now RNA path draws as a label beside the menus, so there shouldn't be any more problems there.
* do_versions code now sets all appropriate flags, as old OOPS views could cause errors with scroller drawing + view manipulation operators which depend on flags being set.