* In the pool class properties table, note whether a pool class uses generational garbage collection.
* The arena has a default generation chain.
* The MPS_KEY_CHAIN keyword argument is now optional when creating an AMC, AMCZ or AMS pool.
* The pool classes AWL and LO now take an optional MPS_KEY_CHAIN keyword argument.
* The pool classes AMS, AWL and LO now take an optional MPS_KEY_GEN keyword argument specifying the generation for new objects.
* Remove material about generation chains from the user guide (just use the arena's default generation chain).
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Change: 184273
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* Use const char * in places where we want to assign string constants.
Avoid warnings when compiling with -Wextra:
* Avoid if statement with empty body in amcsshe.c
* Avoid comparison of unsigned >= 0.
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Change: 183498
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Use MPS_ARGS_BEGIN etc in the Scheme example and in the manual.
Use MPS_BEGIN and MPS_END instead of BEGIN and END.
The _FIELD macros don't need to be function-like macros.
Restore TODO comments in mps.h.
Scheme example compiles with -std=c89.
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Change: 181749
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