This commit reduces the number of freetext editor integration test suite
failures, in full isolation, from 5 to 0 by fixing the following issues
in the "basic operations" block:

- Most tests relied on the first test to enable freetext editing mode.
  For isolation we now do it explicitly in all tests.
- Most tests relied on the other tests having created editors. For
  isolation we now create the editors explicitly in the tests themselves.
- Most tests relied on previous tests for the editor numbering. For
  isolation we change the editor numbering to the one after initial
  document load. Since we can't have state (editors) from a previous
  test anymore we can remove various `clearAll` calls as well.