Version 0.2:
- replaced the icons in XPM format by icons in PNG format from KDE4's
  Oxygen theme (obtained from
  svn://anonsvn.kde.org/home/kde/trunk/KDE/kdelibs/pics/oxygen)
- placed the text edit and the preview area in a splitter so that their
  relative width can be changed by the user
- placed the log text edit in a dockwidget (which can be hidden)
- temporary files are now put in QDir::tempPath() + "/ktikz"
  (on Linux this is /tmp/ktikz), so your working directory remains clean
- closing the application now removes all temporary files and stops the
  thread
- the first time that the thread (generating the output image) is
  executed is not on startup anymore, but when the user actually
  changes the text or loads a file
- images can now be exported to EPS, PDF and PNG
- for some standard actions, the standard key sequence is used (e.g.
  QKeySequence::Open instead of Ctrl+O)
- the toolbars can be hidden
- corrected typo "TiKz" to "TikZ"
- a function runProcess is used which makes the code of generatePdfFile
  and generatePngFile easier (in tikzpngpreviewer.cpp)
- made a better about dialog
