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RELEASE 4.5 1. Fixed a bug in the lock processing logic that meant locks may not have worked correctly in multithreaded programs. Affected the Propeller 2 only. 2. Fixed a bug in the "dining philosophers" demo programs that prevented the programs from exhibiting the expected deadlock behviour. 3. Modified various versions of the "dining philosophers" demo programs to allow most options to be configured on the command line. 4. Fixed a typo in the _thread_stop() library function that prevented it from compiling correctly. 5. Added a workaround to a bug in the dynamic memory management library functions (i.e. malloc(), free() etc) that meant programs would not execute correctly in some circumstances. Affected the Propeller 2 only.