reports object name before invoking each command.

If creating, and object name not of g<N> form, then make an alias too.

so "run" command can do it too.

CONSTify input strings where possible.

Add parti_allobjs() to implement "gall" command.

Add parti_nudge_camera() to aid in tracking objects.

Lots of changes to support new time flow and additional
time-related GUI.  Probably not all there but at least somewhat usable.