Patch for lost linenumbers on 0-length moves

Delay the lookup.  Race condition may still exist.
Needs more investigation but testing shows great improvement.
Patch for lost linenumbers on 0-length moves

Delay the lookup.  Race condition may still exist.
Needs more investigation but testing shows great improvement.
$R to toggle IO Reset
Merge branch 'linenumber-fix' of https://github.com/keyme/grbl into linenumber-fix
Merge pull request #10 from keyme/linenumber-fix

Fix for Linenumbering + IO_RESET