split note in -O3 docs
Hide spammy stderr warning prints when doing a run of the browser test suite to attempt to debug buildbot problem http://trac.buildbot.net/ticket/2901
Merge pull request #2803 from juj/cleaner_browser_test_run

Cleaner browser test run
As per jP_wanN's comment, fix the CMake toolchain file find feature to never look at native system directories, but only look at CMAKE_FIND_ROOT_PATH.
Restore CMAKE_FIND_ROOT_PATH_MODE_PROGRAM to NEVER, since it is useful to find_program() for external system utilities.
Merge pull request #2802 from hamishwillee/incoming

Fixes to debugging topic (and related changes)
Integrate fixes to debugging and optimization topics from ChrisM and Alon
Add test suite doc and update everywhere to link to this. Update developers guide and associated docs
Fix a few broken links