Added an entry in the changeslog and further improved the layout
Implememted ticket #371 "Create search fields for the navigator pages"
Improved detection of functions in mathematical expressions
Implemented a data base file for mathematical symbols in "<expr>" tags
Resolved tree conflicts during merge
Fixed a little styling issue with minus signs at the beginning of exponents
Created branch for experimental changes in the documentation window
Fixed a little typo in the values of the variables table of the debugger
Hopefully finally fixed the heap corruption introduced by the terminal.
Implemented ticket #396 "Add correlation, autocorrelation, covariance"