Fix href_reset_password (missing arg), send_error_email
Add `Single_Dispatch` to `__doc__`
Add attribute type `A_Confirmation`
Improve form-UI for confirmation attributes
Change `_P` to set `.python` after `env ["PYTHONPATH"]`
Add rule for `.full-width`
Factor `E_Type_Mixin._add_other_entries`
Factor `_call_submit_callback`
Fix `GTW.RST.Alias.SUPPORTED_METHODS`
Allow decorator arguments for Single_Dispatch
Factor class/instance property `ui_name_T`
Add `MOM.formatted`; use for registration email
Add `_Required_Mixin_.has_substance`
Open links in AFS forms in separate window/tab
Add `_EPK_Mixin_._check_sanity` to enforce `P_Type`
Factor `GTW.OMP.SRM._Regatta_`
Factor `GTW.OMP.SRM._Regatta_` (fix test)
Redefine `_Changer_.head_line`
Remove `alert` calls; add missing `levl`
Allow ET_Selector to clear selected entity

Triggering the `clear` button, the the `apply` button now clears a
previously selected entity from the appropriate input field.