Docs/GPIO: StrongHelp updated
Resources/!PiLed/!Run: RMEnsure the GPIO module first
Resources/!PiLed/!RunImage: Clarifications and improvements
hdr/Reals: Make space for the Mk2 model B and model A+
s/I2CSWIs: Improvements to error reporting
s/InitModule: Add an API version check against the HAL
s/PiSWIs; s/SupportCode: Resolve some TODO's
s/Tables: The two extra tables for the two extra boards

Submission from Tank. Built, and module loaded, but no runtime testing.

Version 0.60. Tagged as 'GPIO-0_60'