#850852 by Damien Tournoud, dmitrig01, chx: Fixed transaction failure and allow concurrent testing on SQLite

- Patch #890128 by carlos8f, sumitk: comment body missing if comment module enabled after a content type module.

#933856 by Damien Tournoud: Fixed xpath() return values are inconsistent, leading to failing tests on some environments.

- Patch #926016 by effulgentsia, chrisshattuck: several bugs when trying to remove files from a multivalued file/image field.

#438224 by dww, sun, netsensei, vordude, et al: 'Post comments without approval' permission name is completely misleading.

#358437 follow-up by David_Rothstein, sun, chx: Disallow invalid text format IDs; force 0 and non-existant formats to NULL.

- Patch #789186 by effulgentsia: improve drupalPostAJAX() to be used more easily, leading to better AJAX test coverage. (Actual commit so we have proper credit.)

- Patch #789186 by effulgentsia: improve drupalPostAJAX() to be used more easily, leading to better AJAX test coverage. (Rollback)

- Patch #323477 by justinrandell, boombatower, tstoeckler, Damien Tournoud: increase simpletest speed by running on a simplified profile.

- Patch #721086 by rfay, aspilicious, andypost: create tests for system actions, clean up token replacement, clean up triggers.

- Patch #195416 by Damien Tournoud, David Strauss: table prefixes should be per database connection.

- Patch #831732 by solotandem: system_update_7053 needs to check for existence of menu_custom() table.

- Patch #826104 by kiamlaluno: constructor for DrupalTestCase is reported to be the constructor for DrupalWebTestCase.