fix #447
minor cleanup
doc improvements
add some native declarations to refect the Java impl
Metamodel ceylon/ceylon-compiler#1572: do not hang forever and die with a meaningful exception
RuntimeModelLoader ceylon/ceylon-compiler#1572: load the module if possible
FreeClassOrInterface ceylon/ceylon-compiler#1572: skip overloaded abstractions for now
Metamodel: load module dependencies even for bootstrap modules
Metamodel: report UnknownType reasons as exceptions

With proper messages rather than bad luck ;)
Merge branch 'absentTrick_340' of https://github.com/lucaswerkmeister/ceylon.language
i'm a retard
remove sort, add coalesced
fix some tests that failed due to change in List.equals
give Ranged an additional type parameter for #360
fix doc to reflect that the upper bound was removed
fix test
nail down semantics of Ranged for #360
slight doc adjustment
one more clarification for #360
remove restriction which is not satisfied by SortedMaps