Satisfy clang's new MPI datatype warnings
Support no zlib, no python mode
end/config: Use funneled mode by default

Funneled mode is better at least for Cray, so let's make it the default.
Remove redundant python version of show_section
Fix static link
Bluegene doesn't seem to like setting pthread priorities

Happily we don't need to: priority setting only mattered in the
disk-based endgame code.