Add VSA testdata 2015.xtf and organisations

[ponceta]

Describe the bug
For next userday, bring vsa 2015.xtf to work as QGEP import to be then exported to TEKSI wastewater

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots / data
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Desktop (please complete the following information):

• QGEP plugin version
• QGEP datamodel version
• QGEP project file version
• QGIS Version
• OS

Additional context
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