Augmented "wbinfo -m" to list additional information about the type, direction, and...

Augmented "wbinfo -m" to list additional information about the type, direction, and transitivty of trusts.

* added several helper functions to convert the trust_flags field in the
winbindd_tdc_domain to more useful administrator ideas of trust type, trust
direction, and trust transitivity.

* converted winbindd_list_trusted_domains() to enumerate the trusted domain
cache, instead of the domain list, and return additional trust information to
the calling process

* modified wbinfo to pretty print this additional trust information when a new
--verbose switch is given with -m.  Thus "wbinfo -m" and "wbinfo -all-domains"
output as before, but "wbinfo --verbose -m" prints extra trust info.

* updated some comments and fixed typos