Merged branch stringperformance into trunk
Added documentation comments to modified files
Enabled OpenMP support for string function calls in vectorized string expressions. Further integrated MathGL v2.4.4 (see ticket #204 for reference)
Further integrated MathGL 2.4.4. See also Ticket #204 Enabled TIFF support Added some small GUI usability enhancements
Further integrated MathGL 2.4.4. See also Ticket #204
Used new TDM-GCC 9.2.0 for compilation and integrated MathGL 2.4.4. Fixed many warnings and undefined behaviors thanks to new compiler. Performance has been increased by about a factor 2. #204
Further optimized latest test
Test for another string optimization