core: Stamp out XXXes (comments only)
rustc: Stamp out XXXes in middle (comments only)
Replace most invocations of fail keyword with die! macro
implement container::Container for SmallIntMap
drop the StdMap implementation from SmallIntMap
clean up SmallIntMap tests a bit
implement container::Mutable for SmallIntMap
move smallintmap to oldsmallintmap
copy oldsmallintmap.rs to smallintmap.rs
modernize smallintmap

* switch to explicit self
* get rid of the @ box
* replace DVec with ~[] (to get rid of the mutable field)
* implement the new container::Map trait
Merge pull request #4733 from thestinger/smallintmap

modernize smallintmap module
mk: Remove USE_SNAPSHOT_RT, etc. Obsolete. #4713 r=graydon
test cases, cleanup
more cleanup
cleanup for make check