add station_type parameter to load data from join

For data downloading from join, it would be great to set the station_type to look for. In @kleinert1's current implementation, this is done inside the code, but leads to the download of many later unused stations. If this option can be set, only used stations are downloaded.

• implement param in join query
• parse param through all modules
• create filename with station type if set
• can load filename with station type if set
• check in meta data if local available station fulfil station_type criteria

added enhancement label

changed the description

changed time estimate to 2h

added 4m of time spent at 2019-11-15

added To Do label

removed the filename tasks, because a station has always just one single station_type and therefore it is not necessary, to mention the type in the name.

But for data loading, the loader needs to check first meta data, if a station fulfils the requirements of station_type.

changed the description

added Doing label and removed To Do label

marked the checklist item implement param in join query as completed

marked the checklist item parse param through all modules as completed

added 2h 11m of time spent at 2019-11-28

marked the checklist item check in meta data if local available station fulfil station_type criteria as completed

also added check for station_network, can easily expanded inside the check function

mentioned in commit aed8d98b

added merged in Develop label and removed Doing label

added 50m of time spent at 2019-12-02

assigned to @leufen1

closed via merge request !17 (merged)

mentioned in commit 1f2c0182