Improvement idea. Support compressed fingrid csv file

[Christer-Ekholm]

Use case something like this

1. Download csv file from Fingrid "a.csv". File is 12 MB
2. Compress file locally using some popular compression tool. Windows, 7z, ... etc. File size is 3MB
3. Upload compressed file to Liukuri server
4. Server decompress file automatically. Server expects that container have only one file and uses that
5. Server does calculations for user from decompressed csv file