some stuff I want to push upstream

I think these changes are usefull for everybody.

short summery:
714689e option to disable the closing mechanism of the parten frame
8e2882b fixes a bug. Before that the DefaultTab class overwrote the global LookAndFeel (so it was impossible to write an own UI implementation)
0d41a52 makes some properties protected in JhromeTabBorder
3e1a873 add "setTitle(String)" to ITab