Strengthen validy of fragment of view camera

See merge request !546

remove algebra/ dependency on base_logic/

Closes #355

See merge request !549

Thanks @Blaisorblade for reporting.

avoid relying on implicit instance generalization

See merge request !545

clarify the intended use of gen_heap, and rename gen_heap_ctx -> gen_heap_interp

See merge request !542

add counterexample for uPred CMRA extension axiom

See merge request !539

gmap_view: add deletion lemma

See merge request !541

Make `solve_inG` faster.

See merge request !532

1.) First `simpl` away all the functors 2.) Don't use `done`, which calls `split`.

add a general gmap_view library and use it for wsat, gen_heap, proph_map

Closes #328

See merge request !486

fix combining two q/2 fractions to a q

See merge request !540

generalize dfrac IsOp instance

See merge request iris/iris!537