do not traceback when ft_override_host_to_send is not valid, just ignor and print an error message. Fixes #2231

#2223

[misc] use the domain name of the jid to browse disco instead of hostame. Do not use the custom host. Fixes #2208

fix infinite loop when in merged mode and we have twice the same contact in 2 different accounts. Fixes #2160 and #2187

when we select multiple accounts, look into all of them which transport support MUC to enable the New Room in invite submenu. Fixes #2199

allow to invite contact only to room of the same type (jabber contact to jabber rooms, MSN contacts to MSN rooms). Fixes #2199

when we get an error (when we asked meta contact) don't except the server to include the sent request as it's only a SHOULD in RFC3390 9.2.3.7. detect the answer by iq id instead.

we can now register to a transport in add contact window is server has such a transport. Fixes #1944

option to define it.

new add contact window. TODO: enable the register button when our server have this transport. Fixes #872

prevent a TB and print an error message to the user when he/she tries to et a non valid nickname in a room