Fix gsm module to not have sim card adapter hang over board edge

- This would have meant that the board could not be routed post
smt assembly and that the board could not have been panelized at
2x1.3" since the part would not have been assemblable.
- As a consequence, I had to get rid of the screw holes for this
module.
Update C6 label location for readability
Project file update
Merge pull request #48 from timburke/dev

Update gsm module (final version)