xfer: Provide uniform infolists for signal callbacks and infolist hook
core: Bump connect timeout to 14 seconds
weechat: Remove all unnecessary use of PATH_MAX

wee-util: Add util_realpath() which only uses PATH_MAX if necessary
wee-string: Add string_strconcat() which concats variadic strings
wee-completion: Use string_strconcat instead of sprintf()
wee-config-file: Use util_realpath()
weechat.c: Add global weechat_dir_absolute_path
plugin-api: Use global weechat_dir_absolute_path
plugins: Export util_realpath() and string_strconcat()
fifo: Use string_strconcat()
script: Use util_realpath()
Make sure strconcat is NULL terminated
Only use sentinel on GCCv4
core: Be more paranoid when writing config files
xfer: Support IPv6 DCC. This patch for testing only!