Merge branch 'f-revision-module' into r-v0.2rc1

misc/revision_test_data.py

src/core/js/caosdb.js

src/core/js/edit_mode.js

src/core/js/ext_revisions.js

src/core/xsl/main.xsl

test/core/index.html

test/core/js/modules/edit_mode.js.js

test/core/js/modules/ext_revisions.js.js