SciDAVis - Improvements SVN-temp

Added a first implementation of a Spectrogram class (saving and restoring of Spectrograms is not available yet).

- merged/ported changes between 0.8.6-2 and rev 134
into the trunk

- brought class Table back to the state of rev 231,
i.e. it's based on Q3Table again

- creating development branch for features that take too
long to make it into the next release

fixed some problems with variable handling in muParserScripting

- updated muParser to latest CVS version (some minor fixes)
- fixed error reporting of col() and cell(); both in muParser and Python

- ported class Table (worksheet.cpp, worksheet.h) to Qt4
CAUTION: Table still has a lot of issues to be fixed
REMARK: Had to revert the changes to worksheet.cpp and worksheet.h
from the previous revision

- ported improvements to Table/Matrix context menus
- improved support for pygsl
- improved functions menu in ScriptEdit for large function lists

- Corrected various #includes that didn't work on Linux. Please see
http://doc.trolltech.com/4.2/qt4-intro.html#include-syntax
for the correct syntax.
- Fixed several bugs in the scripting code;
Python support now basically works on Windows.
- Added file extensions to ScriptingEnv in order to avoid language-specific
code outside of the language modules.
- Added a Python module with some utility classes and functions.
- Added Lambert's W function to muParserScripting
- Added support for pygsl to qtiplotrc.py
- Fixed bug in saving of Tables (would crash on restore);
added check to Table restore just in case.

- updated German translation to version 0.8.8