* Eliminate compiler warnings in various functions and macros.
* Generalize AO_compare_and_swap primitives via AO_fetch_compare_and_swap.
* Generalize acquire/release/full CAS primitives for MIPS
+* Implement fetch_and_add, test_and_set primitives for MIPS.
* Improve Makefile for MS VC++; pass '-W3' option to MS compiler.
* Include ao_t_is_int.h from atomic_ops.h after first generalization pass
* Merge all Makefile.am files in src tree.