trigger: add plugin name in error messages
core: fix detection of terminated process in hook_process

Check if the process is finished, even if stdout/stderr are not closed.
Moreover, if the process was terminated by a signal, the return code is
set to WEECHAT_HOOK_PROCESS_ERROR.
api: add option "signal" in function hook_set to send a signal to the child process
core: update translations
api: add support of case insensitive search and search by buffer full name in function buffer_search (bug #34318)
fifo: search buffer by full name when text is received in pipe
relay: search buffers by full name
api: add option "detached" in function hook_process_hashtable
xfer: Fix xfer.network.own_ip behavior

Fixes #5. xfer shouldn't try to bind() to the own_ip
address. Instead, always bind to the same local address that is
connected to the irc server, and just change the out_addr if own_ip is
used.

Also fixes a memory leak in error path.
Merge branch 'master' of github.com:talisein/weechat-1