Fix incorrect comparison for args.commit{1,2}
Move gui handling into getProject function
Remove defaults for args.commit{1,2}
Make args.kicad_pcb parameter optional
Call getProject on emtpy args.kicad_pcb
Fill single emtpy args.commit{1|2} with hash of HEAD commit
Alphabetize parameter list (--help output)
Edit README to reflect changes
* separate instructions into Windows and Linux/MacOS sections
* update commandline instructions
Re-added auto-generated full path for plotPCB.py
* saves an extra step for people not running `. env.sh`
* works with `. env.sh` as well