* minibuffer.el (completion-table-with-context): Add support for `pred'.

* minibuffer.el (completion-table-with-context): Add support for `pred'.
(completion-table-with-terminator): Don't use complete-with-action
since we have to distinguish all three cases anyway.
(completion-table-with-predicate): New function.
(dynamic-completion-table): Add obsolete alias.
* minibuf.texi (Programmed Completion):
Replace dynamic-completion-table with the new completion-table-dynamic.