Use LSI OSC for RTC clock when LSE is not detected

Updated teensy to use common code from stm directory.

* Fix rtc_init to use LSI for RTC clock source when LSE is not detected.

Updated mconfigport.h to enable GC

Dictionary features that don't involve views or classmethods. First part of issue #99.

Added 0 to the list of primes. Funky primes, these.

* Fix LED pin enum, first one should start at 1
* Fix LED initialization typo

A more python-style list.sort. And keyword arguments.

Conflicts:
	py/obj.h
	py/objbool.c
	py/objboundmeth.c
	py/objcell.c
	py/objclass.c
	py/objclosure.c
	py/objcomplex.c
	py/objdict.c
	py/objexcept.c
	py/objfun.c
	py/objgenerator.c
	py/objinstance.c
	py/objmodule.c
	py/objrange.c
	py/objset.c
	py/objslice.c

It's not really about that, though; it's about me figuring out a sane
way forward for keyword-argument functions (and function
metadata). But it's useful as is, and shouldn't break any existing
code, so here you have it; I'm going to park it in my mind for a bit
while sorting out the rest of the dict branch.

Conflicts:
	py/objcomplex.c