core: update WeeChat icon: move "ee" to the middle of icon
core: rename weechat_icon_32.png to weechat.png
core: install icon file (patch #7972)
core: rename icon file in Makefile.am
ruby: fix typo in comment
irc: add option irc.look.display_join_message (task #10895)
doc: add note about constants in lua, fix lua example (scripting guide)
Revert "doc: add note about constants in lua, fix lua example (scripting guide)"

This reverts commit fad848bf7caff763ace7a8b88f06307feca77bac.
lua: remove use of functions for API constants
core: mention unit (minutes) for old option "irc.network.lag_disconnect"
script: fix compilation on GNU/Hurd (patch #7977) (thanks to Andrew Potter)

PATH_MAX is now defined in weechat-plugin.h (if not defined, for example on
GNU/Hurd), so that all plugins can use it.
fifo: remove #define MAX_PATH (now done in weechat-plugin.h)
xfer: add option xfer.file.auto_accept_nicks (patch #7962)