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Disabled by default.  Enabled on unix and stmhal ports.

"Base" should rather refer to "base type"."Base object for attribute
lookup" should rather be just "object".

Also, a case of common subexpression elimination.

Addresses issue #1160.

Mostly to have coverage of newly added code in map.c.

Given that there's already support for "fixed table" maps, which are
essentially ordered maps, the implementation of OrderedDict just extends
"fixed table" maps by adding an "is ordered" flag and add/remove
operations, and reuses 95% of objdict code, just making methods tolerant
to both dict and OrderedDict.

Some things are missing so far, like CPython-compatible repr and comparison.

OrderedDict is Disabled by default; enabled on unix and stmhal ports.

To address issue #699.

Fixes for compiler warnings in pedantic mode.

Includes static function fix and all the previous improvements and fixes
by @dpgeorge.

This prevents duplication of objects in the sleep list. Also helps
with reducing the code size by ~100 bytes.

Most boards (except the pyboard) don't have a 32kHz crystal so they
should use the LSI for the RTC.

We already have branch for lookup->is_type == true, so here it's guaranteed
to be false.