NB7.2 HR Fix: #214302 - 7.2 Beta Freezes

Description:
http://netbeans.org/bugzilla/show_bug.cgi?id=214302

There were two threads deadlocking on reversed order of locking editor's 
view hierarchy lock and AWT treelock.

Impact assessment: when the deadlock happened the IDE had to be killed 
and restarted.

Risk assessment: low. The fix should only eliminate the case when view 
hierarchy lock precedes AWT treelock.

The fix has been reviewed by Milutin Kristofic and it should be verified 
by QE.

Changesets:

http://hg.netbeans.org/jet-main/rev/33186a71a0cd
http://hg.netbeans.org/jet-main/rev/f2fa4ce92bef


Thanks for review,
-Mila