* freezer: add readonly flag to table

* freezer: enforce readonly in table repair

* freezer: enforce readonly in newFreezer

* minor fix

* minor

* core/rawdb: test that writing during readonly fails

* rm unused log

* check readonly on batch append

* minor

* Revert "check readonly on batch append"

This reverts commit 2ddb5ec4ba7534bf6edbdfec158ea99a2eed5036.

* review fixes

* minor test refactor

* attempt at fixing windows issue

* add comment re windows sync issue

* k->kind

* open readonly db for genesis check
Co-authored-by: Martin Holst Swende <martin@swende.se>