Deprecated warning with pvlib

[uvchik]

If we are not able to fix that soon, we should restrict the version of the pvlib to <0.9.

.../site-packages/pvlib/pvsystem.py:485: pvlibDeprecationWarning: 

temperature_model_parameters, racking_model, and module_type are not specified. Reverting to deprecated default: SAPM cell temperature model parameters for a glass/glass module in open racking.
In v0.9, temperature_model_parameters or a valid combination of racking_model and module_type will be required.

pvlibDeprecationWarning

[uvchik]

I will be responsible for this Issue, but I do not have time to fix it, so please help.

[p-snft]

I would rather not depend on an outdated version of anything. Instead, I'd rather remove the functionality. If pvlib requires too many details, we might switch to a simple geometric model. (I think that already picking default modules and inverters is somewhat unclean.)