mk: Remove USE_SNAPSHOT_RT, etc. Obsolete. #4713 r=graydon
rustdoc: Convert astsrv to pipes
DO NOT COMMIT
rustdoc: Convert page_pass to pipes
Long lines
Revert "DO NOT COMMIT"

This reverts commit 76679c1f91fc68134c850b2d77ff2b83b32a108f.
update compile-fail/map-types.rs to use hashmap
cat modernization (cleanup of a run-pass test)
remove old StdMap trait

this has been replaced by core::container::Map
rm commented out std::map code from json module

it was replaced by LinearMap
rename map -> oldmap and mark it as deprecated

LinearMap is quite a bit faster, and is fully owned/sendable without
requiring copies. The older std::map also doesn't use explicit self and
relies on mutable fields.