ConcatDataRepo to GeoDTSS

The ConcatDataRepository suffers from poor coverage of unit tests and is therefore difficult to maintain and incrementally improve. The repository also does not utilize many of the capabilities of shyft.time_series, so that performance enhancements could be achieved. A suggestion is then to replace/expand the functionality by parsing the data in the netcdf files into a GeoDtss, and create a repository for retrieving the results. The goal would then be to have modularized building blocks tailored to the various input files, and modularized output in terms of data processing of the different variables.

Main issues:

• Dump data to GeoDTSS
• GeoDTSS repository using ts expressions in geo-evaluation, and preparing source vectors
• Unit tests
• Integration tests (test that the data from shyft_data repo can be parsed)
• System tests (test that the data is approx. the same as from ConcatDataRepository)