Low: raft: add casts for time_t in log_debug

Cast time_t arguments to int64_t, otherwise gcc issues warnings
on format mismatch on 32-bit platforms.
build: add docs to automake
build: add docs/Makefile.am
build: fix generating manpages
build: update the configure compile test
Merge pull request #6 from dmuhamedagic/time-casts

Time casts and build fixes