Ewatercycle-hbv

- Refactor `forcing_file` attribute to `camel_file` -> as essentially it's now a txt file of specific class which the from_camels functions is run on in model startup
- change selection of dataset period to be inclusive
v.1.4.1
- changes to config file: alpha is not needed in model, only in forcing per definition.
- now removes any netcdf files created when using camels or test data
v.1.4.2
- updated parameter function to return nicely formated parameter dict

- formalises forcing: either `.txt` or (two) `.nc` forcing supplied & run corresponding code

- now correctly slices the ds to given start and end time whoops

- now supports camels.txt files natively. Just download the ones you want from there and add it.
- make sure you also include the alpha value which is a model output from the run, defaults to 1.26 but varies per catchment. Eq1 of camels paper.

- pretty big issue with setting values fixed - won't affect most use but will cause issues for Data Assimilation
- use opportunity to name all HBV packages/naming/images to 1.2.0

Adding `.finalize()` method - clears up the directory. Especially useful for DA.