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This is useful if you need precise control over the speed of
peripherals (eg SPI clock).

Erratum in froh.

Also update docs to explain how CAN baudrate is determined.

Hi,

i would like to add a little clarification to the parameter "data" of i2c.mem_read(): I misunderstood 

        ``data`` can be an integer or a buffer to read into

as "i can give a integer variable to read a integer into" .  This pull-request adds the following clarification:

         ``data`` can be an integer (number of bytes to read) or a buffer to read into

Thanks for your great work!

Best wishes,
Matthias

Also restrict higher frequencies to have a VCO_OUT frequency below
432MHz, as specified in the datasheet.

Docs improved to list allowed frequencies, and explain about USB
stability.

gc.enable/disable are now the same as CPython: they just control whether
automatic garbage collection is enabled or not.  If disabled, you can
still allocate heap memory, and initiate a manual collection.

Addresses issue #950.

The inline docs (prefixed with /// in .c files) have been converted to
RST format and put in the docs subdirectory.