Initial Setup / Mandatory Hardware should include ESC calibration and Motor Test

[rmackay9]

I've had a couple of support calls which have shown that some, even quite experienced, ardupilot users are not calibrating their ESCs. Here's a mock-up of a new "Mandatory Hardware" page for motor setup. I've called it "ESC Calibration" but it could be called "ESC / Motor". With this page we could remove the Optional Hardware / Motor Test page because it's functionality is moved to the new page.

We have these two pages on the wiki:

• ESC calibration: http://ardupilot.org/copter/docs/esc-calibration.html
• Configuring motor range: http://ardupilot.org/copter/docs/set-motor-range.html

[geofrancis]

MOT_THST_HOVER and MOT_HOVER_LEARN should also be moved to that page.