Remainder of the qt3 frontend

[Michael Gerz]

Hi,

I found a few places where qt3 is still mentioned:
============================
       // HACK: QT3 refuses to show single compose characters
./src/frontends/qt4/QLPainter.C

       * qttableview.h: fixes for Qt3
./src/frontends/qt4/ChangeLog

               dnl found both. Prefer Qt3's if it exists else moc2
./config/qt.m4

   # [/path/to/lyx.ext] => lyx-qt3.ext
./development/scons/SConstruct
============================

Abdel, shall we remove the code in QLPainter.C? How about "ChangeLog". I 
am tempted to delete it.

What about qt.m4? Is it still needed? There is also a qt4.m4.

Michael