Allow stack.patchorder.all to return hidden patches

A new property, patchorder.all_visible, was added to return only the
applied + unapplied patches. This is used in the "commit" command to
avoid automatically committing the hidden patches.

Signed-off-by: Catalin Marinas <catalin.marinas@gmail.com>
Acked-by: Karl Hasselström <kha@treskal.com>