Error fixes

Changed:
placeBlock(): Fixed some stupid errors and redid the entire function
convertDirectionNum(): Fixed stupid errors. Still needs an overhaul for the rest of the function
turtleMove(direction): Fixed if statements.
turtleTurn(direction): Fixed if statements.
detectScrapBlock(dir): Fixed if statements. Still needs overhaul. It's repeating itself :S

Probably a lot more...