Function not exists and strict warning

Fixing a function not exists, because ctools plugin files has not been
included in _os2web_esdh_provider_status().

Also fixing a strict warning "Only variables should be passed by
reference" in the same function.
Makes it possible to overwrite the text format used for the bpa body field.

Checks if the constant MM_BPA_BODY_FORMAT is set in one of the mm
plugins, and if it contains an existing text format is it being used
for the bpa body field.
Added a check if full_doc is empty before adding it to the meeting node.

Without this check will an empty file be added if no file exists. The
ESDH system FICS does not have a full doc version of a meeting.
Removing security vulnerability in the admin/os2web/import/ callback.
Removing strict errors in PHP 5.3
Merge pull request #2 from beltofte/develop

Fixing a security vulnerability, warnings, strict errors and adding a new feature.
Merge branch 'develop' of github.com:OS2web/os2web_esdh_provider into develop