Copter: fix SingleCopter motor parameters link
Copter: prefix SingleCopter's MOT param description

This should allow single copter's MOT_ parameter descriptions to be more
easily recognised as belonging to SingleCopter when viewed on the wiki's
arducopter-parameters page
Copter: increase min LAND_SPEED to 30cm/s
updated analog pin defines, hal.analogin converts the raw number to the correct pin number automatically.
Merge branch 'master' of https://github.com/diydrones/ardupilot into HoodCopter