switched to netbeans version 7.4
Manually persisting outline views

Netbeans' OutlineView is quite buggy especially when it comes to
persistence. This has been causing me headaches for a while now.
This commit rolls my own persistence routine which is by no
means complete. Several things cannot be persisted yet:

  - Rearranging the ordering of columns
  - Sorting of columns

However, it works, although it is really hacky involving some
evil reflection to access the hidden columns in an outline view.
Crap.