Preparing for maintenance release:

Preparing for maintenance release:

Kernel source changes:
- Added xTaskNotifyStateClear() API function.
- Added the GCC Cortex-R port (existed for a while) into the main download.
- Improved the IAR RL78 port's handling of different memory model combinations.
- Removed some compiler warnings in heap_5.c.

Demo app changes:
- Added example use of xTaskNotifyStateClear() to the TaskNotify standard demo tasks.

git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@2389 1d2547de-c912-0410-9cb9-b8ca96c0e9e2