Fix image insertion in the body test for IE7.
Merge branch 'imageAndLink' into exec-tests
Merge branch 'exec-tests' into issue_512

Conflicts:
	src/test/unit/specific_feature_tests/links.js
testWymManipulation -> manipulationTestHelper. It doesn't wrap test().
Merge branch 'manipulationTestHelper' into imageAndLink
Link and image tests use manipulationTestHelper.
Merge branch 'imageAndLink' into exec-tests
exec manipulation tests use manipulationTestHelper.
Merge branch 'exec-tests' into issue_512

Conflicts:
	src/test/unit/specific_feature_tests/exec_manipulations.js
	src/test/unit/specific_feature_tests/images.js
	src/test/unit/specific_feature_tests/links.js
	src/test/unit/utils.js
Undo/redo tests use manipulationTestHelper.