Issues and Improvements regarding geojson

[KS-HTK]

Issues

• [x] Simple plot currently only plots lines that have geodata. #2275 (fix in #2280)
• [x] create_line_collection/create_bus_collection ignores lines/buses indecies and plots everything. (fix in #2280)
• [x] create_line creates invalid geojson objects. list of coords in nested to deep.
• [ ] convert_format not updating bus_geodata/line_geodata table.

Improvements

• [x] create_buses expects list as docstring says but previously could use other iterables. Should accept any iterable.