New option for startup GUI to start the main process (runAnalysis)  on a computing grid as an independent process which can launch the other processes if the parallel grid computation is selected. Otherwise the analysis is ran in grid in a single process.

This makes possible to run the analysis in four different ways:
- local run on the computer where the GUI is started
- local run with parallel grid implementation; the main process runs on the computer where GUI is started, but the analyses are executed on the grid
- single grid process, the main process is executed in single grid process and analyses are run in the same process.
- full grid implementation; the main process is executed in single grid process and it starts the parallel processes in the grid for analyses.