GitLab

Fixes the bug where the XML output path is affected by test changing the current directory.  By Stefan Weigand.

* changes the XML report format to match JUnit/Ant's.
* improves file path handling.
* allows the user to disable RTTI using the GTEST_HAS_RTTI macro.
* makes the code compile with -Wswitch-enum.

Improves thread-safe death tests by changing to the original working directory before they are executed; also fixes out-dated comments about death tests.