Remove the one big test file
Add method to load all symbols from submodules of in a given directory
Distribute account related tests into the account app directory
Distribute blog related tests into the blog app directory
Distribute core related tests into the core app directory
Distribute form related tests into the form app directory
Distribute gallery related tests into the gallery app directory
Distribute pages related tests into the page app directory
Use the new plural tag `richtext_filters`

to avoid warnings. The `richtext_filter` template tag is deprecated.