Thanks to Jim McDonough <jmcd@samba.org> for this.

Thanks to Joe Brockmeier <zonker@opensuse.org> for proofreading.

The directory version number is the soversion of the library.

This removes an uneeded syscall to lstat by mktemp at this point.

If csync is running in a pam module and the module isn't linked
against the cstdlib, the module segfaults.

Document and fix a problem in getting the phash value.