+ Introduced API function xTaskResumeFromISR(). Same functionality as
xTaskResume(), but can be called from within an interrupt service routine.
+ Optimised vListInsert() in the case when the wake time is the maximum
tick count value.
+ Bug fix: The 'value' of the event list item is updated when the priority
of a task is changed. Previously only the priority of the TCB itself was
changed.
+ vTaskPrioritySet() and vTaskResume() no longer use the event list item.
This has not been necessary since V4.0.1 when the xMissedYield handling
was added.
+ Lowered the PCLK setting on the ARM9 STR9 demo from 96MHz to 48MHz.
+ When ending the scheduler - do not try to attempt a context switch when
deleting the current task.
+ SAM7X EMAC drivers: Corrected the Rx frame length mask when obtaining
the length from the rx descriptor.
When resuming a task a check is first made to see if the task is actually suspended.
vTaskPrioritySet() and vTaskResume() no longer use the event list item. This has not been necessary since V4.0.1 when the xMissedYield handling was added.
