std: Remove ThreadPerCore spawn mode. Unused
tutorial: remove duplicate link references.

`pandoc` issues warnings.

```
pandoc: Duplicate link reference `[macros]' "source" (line 2151, column 1)
pandoc: Duplicate link reference `[tasks]' "source" (line 2150, column 1)
pandoc: Duplicate link reference `[wiki-start]' "source" (line 92, column 1)
```
tutorial: remove unused link references.
Remove --quiet from git submodule operations
Add documentation about mutable statics to rust.md
std::rt: Rename RUST_TEST_THREADS to RUST_RT_TEST_THREADS
rt: Diagnose bad alloc index in release_alloc with RUSTRT_TRACK_ALLOCATIONS
rt: Print alloc backtraces for bad release_alloc with RUSTRT_TRACK_ALLOCATIONS

Probably the env var should be renamed from DETAILED_LEAKS but I'm leaving
aside that breaking change for now.
testsuite: Add compile-fail test for #5883
testsuite: Test for #6153, closes #6153
Fix warnings in libextra tests

Most of these are "unneccesary allocation" in bitv, for ~[false, ..] instead
of [false, ..].
Fix warnings in libstd and librusti tests
remove non-portable sed invocation as brson says we no longer have clang in tree.
hashmap: Remove .consume() has rename .consume_iter() to .consume()

Updated all users of HashMap, HashSet old .consume() to use .consume()
with a for loop.

Since .consume() takes the map or set by value, it needs awkward
extra code to in librusti's use of @mut HashMap, where the map value can
not be directly moved out.
auto merge of #7833 : blake2-ppc/rust/hashmap-consume, r=alexcrichton

Updated all users of HashMap, HashSet ::consume() to use
.consume_iter().

Since .consume_iter() takes the map or set by value, it needs awkward
extra code to in librusti's use of @mut HashMap, where the map value can
not be directly moved out.

Addresses issue #7719
auto merge of #7845 : gifnksm/rust/tutorial-remove-dup, r=cmr

`pandoc` issues warnings.

```
pandoc: Duplicate link reference `[macros]' "source" (line 2151, column 1)
pandoc: Duplicate link reference `[tasks]' "source" (line 2150, column 1)
pandoc: Duplicate link reference `[wiki-start]' "source" (line 92, column 1)
```

This PR also removes unused link references.
auto merge of #7846 : alexcrichton/rust/static-mut-dox, r=pnkfelix

It's probably a good idea to at least *mention* them somewhere.
auto merge of #7847 : alexcrichton/rust/verbose-submodule, r=pnkfelix

Closes #3816.

Without --quiet, git shows its own progress report of download. It's not really a progress bar, but it's a percentage and files incoming. This will help initial downloads of LLVM to not cause people to wonder why their configure script is hanging for hours.

r? @graydon
auto merge of #7854 : brson/rust/rt-test-threads, r=pcwalton
auto merge of #7856 : brson/rust/no-thread-per-core, r=pcwalton

This doesn't make sense under the new scheduler.