add an advanced option: restored_message_small tu disable small font in restored messages. Fixes #2048

handle advanced notification for new_message event only (without systray / roster / urgency hint that require a event refactorizatin)
use subprocess module as we depend on python2.4

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