Add variable support to PRINT.. AT and add some debug info.
It's column,row and not row,column.
Fix game locking bug(print "crash" at (8,9.) and added soem debug. This will not handle nested brackets but can probably be made to do so.
Cleaned up indent and fixed nested brackets.
Fixed issues where you could pass negative number to Put causing it to escape range.
Merge pull request #72 from a1270/printatvarsupport

Fixes game locking bug, adds var support to PRINT.. AT and adds some debugging.