mod_development: show debug message when reloading a module.
core: added z:log_level(debug | info | warning | error) to set the console backend log level.
mod_authentication: remove reload of other open 'tabs' on log on/off.
This gives a race condition in Chrome as Chrome doesn't close the Websockets channel during redirects (which are setting the new cookies)
mod_base: added 'only_text' option to alert. Corrected documentation.
mod_facebook: fixes to redirects etc.