fix #1033 Removing wrong lines in the MultiAutoComplete.

This commit removes two lines which set a new value in
the data model when pressing tab if the field is empty
and not positioned at the end of the options (i.e. when
leaving the edit mode through tab if the field is empty).

There is no reason to set the value at that time as the
value has not changed, and this can lead to the onchange
handler being called later when the value has not changed.
feat #1031 Removal of TemplateCtxt.getDomId method

Method `getDomId` of class `aria.templates.TemplateCtxt`, deprecated in version 1.4.12 (200f52d1031c9411601214675df8bab8697b8f98) has now been removed.
feat #1037 Removal of backward compatibility for class aria.utils.History

Class aria.utils.History was kept backward compatible with respect to a previous implementation. Deprecation was done with commit b3a657997f650bcb8d6316ecae97208c36e84886.