[PATCH] KTabWidget / KTabBar changes for Qt 4.5

[Urs Wolfer]

Please review the following patch.

Changes related to Qt 4.5 QTabWidget / QTabBar improvements:
* Deprecate:
  * KTabBar/KTabWidget#isTabReorderingEnabled; use QTabBar#setMovable
  * KTabBar/KTabWidget#setCloseButtonEnabled; use QTabBar#setTabsClosable
  * KTabBar/KTabWidget#setTabCloseActivatePrevious; use 
QTabBar#setSelectionBehaviorOnRemove
  * signal KTabBar#moveTab; port to QTabBar#setMovable and connect to 
QTabBar#tabMoved
  * signal KTabBar#closeRequest; connect to QTabBar#tabCloseRequested

Remove all the close icon related code; call instead QTabBar code internally 
already.
There are some known rendering issues with Qt 4.5 QTabBar which need to be 
fixed in Oxygen style. See #184782.

Bye
urs
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