ThermalNetwork: components.csv and component_attrs needs clean-up

[jnnr]

Some of the information given in components and components_attrs is not up-to-date any more. Before the release, we need a review and clean up.

In components.csv

• [x] Delete ThermalSubnetwork - does not exist yet. Deleted
• [x] TransferStation same
• [x] ThermalStorage same
• [x] environment - is it used? Yes
• [x] Input/Output: Is this used? Not really. Can consider this when integrating optimization and simulation. OK for now.

In components_attrs:

• [x] unit rendered as dot. Render as hyphen.

• [x] node_type necessary? Yes.

• [x] rename node_type to component_type and add to requirements

• [x] Some variables have different variable names in different places (with and without units):

  ThermalNetwork vs NumpySimulationModel length length_m diameter diameter_mm heat_transfer_coeff heat_transfer_coefficient_W/mK roughness roughness_mm

• [x] In type, mention that these can be either float/series

  mass_flow temp_drop temp-env