Shifted around global variable definitions
Most global variables definitions (mostly boolean) were moved
inside the check_options_and_args function
Fixed bug in Analyzed_interval.txt segment length
Minor output formatting fixes
Error handling fixes
Reverted to 100 DPI for glitchgram.
If changing to higher DPI change html file to use a fixed width
image (otherwise it will be too big for the screen).
More stuff to do