UI with 1 in- and outfile, 2 float spinboxes and 2 int spinboxes
rename positions_2d_to_bitmap.py to spots_to_bitmap.py
adjust spinbox max values
UI with 1 in- and outfile, 2 double spinboxes and 2 int spinboxes
add spots to bitmap GUI
PEP8 compliance
set default output bitmap size
check for sane input size values
allow presetting more widget types
don't override presets with default values
improve readability (PEP8)
comments only
display effective commands on execution
increase number of decimals
testing of spots_to_bitmap_gui.py
improve GUI testing