mod_base: remove debug from controller_postback
mod_base: in controller_comet, catch session exceptions, serve as forbidden.
core: set default task-id if task-id is undefined.
core: in m_media catch rsc insert exceptions.
core: add is_a list to the #edge_insert, -update and -delete notifications.
mod_comment: don't crash on missing ReqData (for the wrq:peer/1 call)
core: Add global 'template_modified_check' flag to disable template modification checks

This eliminates a bottleneck observed in z_template on a system under
load. When 'template_modified_check' is true, z:flush() needs to be
called to trigger recompilation of new / changed templates.
core: Fixes the "fix" for the edge_log trigger. Fixes #820
core: Removed old stats model
core: do not try to logon from the session if there is no session. Issue #816
core: add function z_session_manager:stop_session/2 to stop a session by id.
core: if a page or user changes then also pass the previous page/user-id so that the scripts can see what changed. Issue #816
mod_editor_tinymce: fix nl translation of 'Ok'
mod_admin_frontend/mod_editor_tinymce: make mod_admin_frontend work well with mod_editor_tinymce.
mod_editor_tinymce: fix problem where tinymce coulde be initialized with a non-supported language. Add 'do_zeditor' to initialize individual textareas with a fulltext editor.
mod_base: Remove usage of symlinks in jquery files

Fixes #812
docs: minor change for overrules docs.
core: prevent leakage of query args from one transport to the next. Ensure query validation.
core: use transport for moving the upload progress to the browser.
core: add some convenience functions to z_session_page for looking up session_id, stopping and checking attach state by context