Continuing better Viewing (#447) (#453)

* add: add first version of new tests

* add: add more tests for new view

* fix: add cumsum_nseg to View and remove cell_list in Network after used to init SolveIndexer

* fix: ammend prev commit

* fix: fold todos into funcs

* wip: save wip, rm pre/post,make delete methods local, fixes

* fix: fix trainables and local inds in edges

* fix: fix jit simulate with data_stimulate issues and streamline edges

* fix: make remaining tests pass

* fix: ammend last

* doc: prepare for review

* wip: save wip

* fix: all tests passing, address review comments

* fix/rm: rm test for laxy indexing into groups, and rebase onto main.

* fix: small refactor

* fix: fix move_to issues. caused by not allowing cell.cells

* doc: add comments