Support loading of Pdf Survey form

[Brian Lewis]

Allow Pdf Survey (as used in Kiribati) to be loaded through the web interface, similar to exam and kobo load functions.

Loading the Pdf will:

– extract the xfdf data from the pdf file

– create the survey if required.

– load the data from the survey into the database (including but not limited to enrolments, repeaters, disability, teachers, classrooms, resources)

– store the pdf document in the school’s document list

– associate the pdf document with the school survey (ie as ssSource)

– store the xfdf against the school survey in the table SchoolSurveyXml_

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[Brian Lewis]

I’ve introduced the SchoolSurveyXml_ table rather than use ssData becuase of the size of the data (typically over 100K). Simple queries like

select * from SchoolSurvey

would become ungainly.

[Brian Lewis]

https://bitbucket.org/softwords/pineapples/pull-requests/693