Create export for import to OpenSkin

[Ed McDonagh]

As an initial integration with @jacole 's https://bitbucket.org/jacole/openskin create a simple export of the form OpenSkin requires

[Ed McDonagh]

Initial work on OpenSkin export. Refs #192

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[Ed McDonagh]

Finished first pass of export fields. Corrected mistake of last night's commit to reference at the event level. Refs #192

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[Ed McDonagh]

Completed first draft of export routine for OpenSkin compatible csv files. Removed unused imports. Next is to create URL and view to feed it, and link on detail page. Refs #192

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[Ed McDonagh]

Added openskin export to urls and views and tested - nominally seems to work. Added to detail view, yet to test. Refs #192.

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[Ed McDonagh]

Corrected url link from detail page, which now works. However not all the fields are correct yet. Refs #192

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[Ed McDonagh]

Corrected reference point dose field. Now seems to work, testing in progress. Refs #192

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[Ed McDonagh]

Export of fluoroscopy study data in a form that can be used by OpenSkin now available. Interface/instructions could do with some love. Fixes #192

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[Ed McDonagh]

Ref #61