Revised classes for investments in generic arcs and in district heating trenches. Updated converter and dynsys tests.

Revised ResourcePrice class and methods. Added tests for problem simplification routines. Started problem identification method.

Renames arcs as edges within the GIS module. Removed redundant methods. Added 100% coverage for the identify module. Path simplification routines streamlined and tested.

Simplygraph

See merge request !1

Revised the methods for creating profiles to use the min to max ratio. Fixed warnings originating from osmnx deprecations.