Changed .h ifdef/defines to use <NAME>_H format. --HG-- branch : HEAD

Added auth_request_log_*(). --HG-- branch : HEAD

Added default_pass_scheme to LDAP. Support for more password schemes. Merged password checking code with LDAP and passwd-file, so both support the same schemes now. --HG-- branch : HEAD

We have now separate "userdb" and "passdb". They aren't tied to each others in any way, so it's possible to use whatever user database with whatever password database. Added "static" userdb, which uses same uid/gid for everyone and generates home directory from given template. This could be useful with PAM, although insecure since everyone uses same uid. Not too well tested, and userdb/passdb API still needs to be changed to asynchronous for sql/ldap/etc lookups. --HG-- branch : HEAD