Resolved the indentation issue of #606
Implemented ticket #616 "Use new complex numbers for fft"
Added the terminal feature to select only matching history commands based on the characters the user already entered. Implemented ticket #606
Deleted merged branch for ticket #601
Merged branch for ticket #601 to trunk
Improved implementation of tikcet #601 - Removed obsolete files - Resolved an issue detected during tests
Improved the implementation of ticket #601 - Resolved an issue detected during tests
Resolved an issue in implementation of ticket #601
Created a set of file IO tests for #601 and resolved detected issues
Improved implementation of ticket #601 - Fixed file reading issues - Improved string-to-value convertability detection - Added auto-type-conversion of columns, if the user selects the whole column as target