mk: tests.mk simplify the method to clean arm testing directory
etc: modify adb_run_wrapper.sh to avoid 'expr' unrecognization at some android devices
etc: add TEST_EXEC_ENV for run-pass to adb_run_wrapper.sh
test: adjust some test cases of run-pass for android
std: fix stat struct of android (SEGV error from run-pass/stat.rs on android)
Support printf formats in terminfo strings

terminfo parameterized strings supports a limited subset of printf-style
formatting operations, such as %#5.3d.
Remove all #[cfg(stage0)]-protected code

New snapshot means this can all go. Also removes places that have
comments that say they are workarounds for stage0 errors.
libstd: cleanup warnings
libsyntax: cleanup warnings
libextra: cleanup warnings
librust: cleanup warnings (except 1)
Update snapshots.txt
auto merge of #7128 : yichoi/rust/fix_sometc, r=brson

- Fix stat struct for Android (found by SEGV at run-pass/stat.rs)
- Adjust some test cases to rpass for Android 
- Modify some script to rpass for Android
Get cross crate default methods working.

This fixes the large number of problems that prevented cross crate
methods from ever working. It also fixes a couple lingering bugs with
polymorphic default methods and cleans up some of the code paths.

Closes #4102. Closes #4103.
auto merge of #7161 : kballard/rust/terminfo-parm-format, r=thestinger

Introduce support for terminfo's subset of printf-style formatting on doxXs operations.

r? @thestinger
auto merge of #7203 : msullivan/rust/default-methods, r=graydon

This fixes the large number of problems that prevented cross crate
methods from ever working. It also fixes a couple lingering bugs with
polymorphic default methods and cleans up some of the code paths.

Closes #4102. Closes #4103.

r? nikomatsakis
Added overview of the debuginfo module at the beginning of debuginfo.rs.
Reordered debuginfo.rs and commented public fns
debuginfo.rs: Removed some static constants not used anymore.
debuginfo.rs: Explained why a function is called although one could think it should not be.