updates:
-INTEGRATE: updated Simpson's rule with better handling of the Even/Odd step problem
-PARSECMD: added parsing of 1-dimensional array variables (R8,I4,L,Ch)
-TIMER: some adjustments and fixing for progress_bar.
start_bar,stop_bar are removed in favor of start_progress,stop_progress, that is
used for all the progress routines.
A simple progress routine is introduced that show the percentage of the progress of a loop,
with no further info.