Changes

Bug 1225: Make unit test more robuts, notify if JRE 1.7.0 issue w/
interrupted AWT-EDT
The reporter claims that an interrupt on the AWT-EDT shall not disturb
neither AWT nor JOGL's GLCanvas and rendering shall continue.
- This seems to be true for JRE 1.8.0_60
- This seems to be false for JRE 1.7.0_45. This JRE's AWT-EDT even dies
occasionally when interrupted.

NEWT WindowImpl.createNative(): Post creation: Only perform mod-actions
if non default (performance)

Bug 1205 - NEWT Security: Clear framebuffer after creation and before
visibility (Windows Onscreen)
WindowsWindow.c:
 - WindowUserData.isInCreation set while window at initizalization,
   i.e. before final size/pos/visibility.
    Also no visibility until final NewtWindow_setVisiblePosSize(..)
call.
   This is possible since even w/o ShowWindow upfront,
   UpdateInsets(..) is able to gather accurate values.
  - Suppress any Java callback while WindowUserData.isInCreation,
   issue one callback when window is final.
   Use newly accumulated callback
WindowImpl.sizePosInsetsFocusVisibleChanged(..)
  - While WindowUserData.isInCreation, WM_PAINT triggers WM_ERASEBKGND
   and WM_ERASEBKGND actually erases background w/ window background
color.