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let users access iFrame helper tactics

See merge request !648

Make Iris compatible with name mangling

Closes #343

See merge request !647

New Camera dyn_reservation_map and generalize namespace_map → reservation_map

See merge request !646

Use ghost_map in proph_map and gen_heap

See merge request !645

Flexible number of logical steps per physical step

See merge request !595

* Rename ghost_map_elem_elem_frac_ne → ghost_map_elem_frac_ne,
  ghost_map_elem_elem_ne → ghost_map_elem_ne.
* Make ghost_map_elem_persist work for arbitrary `dfrac`.
* Add ghost_map_insert_persist.

add ghost_map library

Closes #358

See merge request !562

Makes it possible to use several logical steps for one logical steps, in a way which can be controlled by ghost state.

Generalize frac to dfrac in auth and view camera

Closes #395

See merge request !622

Fix typos

See merge request !644