implement \webinit\UserMap->hasUser($userId) to also allow \webinit\User instances
update documentation for \webinit\UserMap

C. Fahner <info@fahnerit.com>
update documentation for \webinit\WebInit
add version conversion method

C.Fahner <info@fahnerit.com>
update documentation for almost every class in webinit namespace

C. Fahner <info@fahnerit.com>