thread entrypoints:
(lwpSelect, shutdown_sequence): Parameters didn't match thread entry
point prototype.
(lwpEntryPoint): Arguments didn't match thread entry point prototype.
Change linkage of functions without prototype declaration to static
where possible.
Remove some superflous declarations, replace others by suitable
includes.
that commands must be unique within the first four letters. best()
implements both. It calls BestDistPath() for the former, and
BestLandPath() for the latter. However, BestDistPath() is just a
wrapper around BestLandPath(); it does exactly the same. Drop
`bestdistpath'.
