Fixing a security vulnerability, warnings, strict errors and adding a new feature.

1. Fixing a function does not exists, because ctools plugin files has not been
included in _os2web_esdh_provider_status().

2. Also fixing a strict warning "Only variables should be passed by
reference" in the same function.

3. Makes it possible to overwrite the text format used for the bpa body field.

4. Added a check if full_doc is empty before adding it to the meeting node.

5. Removing security vulnerability in the admin/os2web/import/ callback.