Enhanced priority dis-inheritance functionality in the case where a task that caused...

Enhanced priority dis-inheritance functionality in the case where a task that caused another task to inherit its priority times out before obtain a mutex.
Added test code to GenQTest to test the new priority dis-inheritance functionality.
Allow the default names given to the Idle and Timer tasks to be overwridden by definitions in FreeRTOSConfig.h.

git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@2478 1d2547de-c912-0410-9cb9-b8ca96c0e9e2