editeng: activate some more assertions hidden behind dbglevel=3

Change-Id: I46c168946c51f1c8064f5902aa97fb0c5b7a3934
editeng: convert that to assert

Change-Id: I03e43d35efb813f985b93bc05c3b50c4462f9111
editeng: there's yet another checking function hidden at dbglevel=3

Change-Id: Idd54bd4fd87cd138a2daf363bd692440a01e2624
editeng: it's like there's a nest of these things

Change-Id: Iceef908e8cc1e7a2849398bd2d9e6e7cb1a9e9c9
editeng: let's assert attribute consistency in some more places

Change-Id: Idf3a1eb821b3b938f1bdd04bf449ade190703ab3