change name length from 32 to 64, perhaps we should have some constant here bpy.constants.NAME_MAX ? - but this hardly ever changes.

also hide allow overlap option for adding sequence strips, this was only intended for api use

clip/mask parenting from previous commit
- clear parent wasnt working
- selecting tracks now works when mask editing

debugging check for bmesh (commented since its very slow), but useful for debugging some scripts.

mask parenting operator, and clear parenting. (Ctrl+P, Alt+P)

- also use offset now with parenting.
- draw line from point to parent.

fix for fix - possible on second loop to use freed memory still.

fix for unlikely but possible use of uninitialized pointers.

code cleanup: remove some old comments

fix for minor annoyance when an operator is called by another - dont add blend file to recent history.

this way demo-mode addon doesnt clobber the recent history with demo files its operator loads.

Quiet null pointer free warning/error.

py api integration: __import__(... , level=0)
default changed to work with python3.3