Introducing MMaps, a modernized FMaps.

 NB: this is work-in-progress, there is currently only one
 provided implementation (MMapWeakList).

 In the same spirit as MSets w.r.t FSets, the main difference between
 MMaps and former FMaps is the use of a new version of OrderedType
 (see Orders.v instead of obsolete OrderedType.v).

 We also try to benefit more from recent notions such as Proper.

 For most function specifications, the style has changed : we now use
 equations over "find" instead of "MapsTo" predicates, whenever possible
 (cf. Maps in Compcert for a source of inspiration). Former specs are
 now derived in FMapFacts, so this is mostly a matter of taste.

 Two changes inspired by the current Maps of OCaml:
 - "elements" is now "bindings"
 - "map2" is now "merge" (and its function argument also receives a key).

 We now use a maximal implicit argument for "empty".

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