Replace logical AND by binary AND. Fixes #40 and FS#975.
Merge pull request #45 from kheyse/boolean_and

Replace logical AND by binary AND. Fixes #40 and FS#975.
Fix DSC target position calculations (ChuckSK - http://www.cruisersforum.com/forums/f134/o-3-2-and-dsc-100992-2.html#post1200978)