Functions for external memory management of scratch and stream objects #109
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… streams and scratch areas. Also fixed potential bug where the alignment to 64 bytes cache line might shorten a scratch area too much. Added unit tests for the new external memory interfaces.
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Pull request for a simple set of features that make it easy for external memory management of the scratch and stream objects without going through the four static memory allocators. This is essential for high performance in NUMA (Non-Uniform Memory Architecture) systems such as Linux. Also addressed a corner case where scratch objects may be shorted when cache aligned.