* src/ejabberd_listener.erl: New way to configure IP address and

* src/ejabberd_listener.erl: New way to configure IP address and
IP version of listener. Support for definition of IP address in
string format, and implicit definition of IP
version (EJAB-388). Support for defining several listeners: all
with same port number but different IP addresses (EJAB-389)(thanks
to Fabrice Colliot and Sergei Golovan). Better report in WebAdmin
of problem when starting a listener. The old configuration method
of ip tuple and inet6 is fully supported for backwards
compatibility, but is not documented in the Guide anymore.
* src/ejabberd_config.erl: Likewise
* src/mod_proxy65/mod_proxy65_stream.erl: Likewise
* src/mod_proxy65/mod_proxy65_service.erl: Likewise
* src/web/ejabberd_web_admin.erl: Likewise
* doc/guide.tex: Document the new way to configure IP address and
IP version of listener, undocument options ip and inet6
* doc/guide.html: Likewise

SVN Revision: 1812