CVS commit by fedemar: 

* Fix function arguments: QString -> const QString &
* Prevent a crash if you try to add an incorrect function and then click on the main widget.
* Made some variables consts.
* Cleaned Parser::addfkt() a bit.


  M +9 -8      View.cpp   1.105
  M +2 -14     parser.cpp   1.36
  M +5 -5      parseriface.h   1.2
  M +17 -15    xparser.cpp   1.31
  M +5 -5      xparser.h   1.30