fix doc tpyos, rename some enums, fix printf format len for non-zero terminated strings (hg status), pass args to memcache_cmd_format_header via memcache_req_*, handle zero-length STORE requests, memcache_req is_buf_ours + free, other function name typos (keymemcache_req_key), fix req state behaviour re *_DATA_* for STORE requests and FETCH/END, better memcache_server connpool events/management, modular memcache_test with a working benchmark. This is a long commit message.

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