Make OpenSkin export only consider Cu

[Ed McDonagh]

Format of export only allows for one filter material, and OpenSkin only considers Cu anyway.

Current export fails if more than one filter material is present.

[Ed McDonagh]

Only Cu filters now reported for OpenSkin export. Need to edit export text to make this explicit. Refs #384

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[David Platten]

Updated the skin dose map settings page. Added a link to a help document that doesn't exist yet... References issue #61 and issue #384.

Sorry - should have referenced issue #382.

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[Ed McDonagh]

Added note to export text. Refs #384

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[Ed McDonagh]

Only copper filters now included in OpenSkin exports. Fixes #384

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[Ed McDonagh]

@dplatten this will cause you a conflict on merge as I've updated the text for OpenSkin export that you have deleted.

I guess just take your version for now in your branch. If the system is configured to not integrate OpenSkin, then something akin to the current text and export function should remain.

[Ed McDonagh]

Updated CHANGES/changes. Refs #384

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[David Platten]

Hi @edmcdonagh. I'll add the current text and export option for when OpenSkin calculations are switched off to the issue #61 branch.

[David Platten]

Added openSkin data export back to the rfdetail page if skin dose map display is switched off. Also included the text about only Cu filters being included. Added some text to let the user know that this version of OpenREM can calculate and display skin dose maps for some systems. References issue #61, issue #382 and issue #384.

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[David Platten]

Removed duplicate line that was included after the sync with develop. References issue #384

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