Added new matop function 'shuffle()' and inserted many DoxyGen comments
Multiple fixes for procedures
Fixed an issue in implementation of ticket #515 Strange random errors occuring only late in calculations Additionally fixed that the busy indicator did not pulse, when a command was executed by double-clicking on it in the history
Implemented ticket #517 "Add 'getkeyval()' function"
Fixed an issue in implementation of ticket #515 "polynomial()" was used erronously as multi-argument function
Fixed issue #519 "Crash during saving"
Fixed issue #515 "Expressions like 'and(data(:, 1) == data(:, 2))' are not resolved correctly"
Implemented ticket #509 "Add the possibility to remove keywords from index"
Fixed issue #514 "Errors in 'matop'"
Implemented part of ticket #509 Cleaned the code of doc_helper.cpp