Investigate AFLOW error connection in CI

[pedrobcst]

Currently, the CI is failed due to a connection issue with AFLOW.

Github actions is failing to connect to AFLOW using urllib, even though the connection to the COD seems to be working fine. This is leading to a error in the CI tests since the structures cannot be downloaded for testing the solvers. If the tests are run into a local machine (ie, my machine), they will successfuly pass.

Have to find a way to fix this. For the moment I will create a seperate branch where AFLOW is disabled and confirm the tests pass there.

[pedrobcst]

The best current action seems to totally disable AFLOW. The lack of control of structures coming (no way to query only stable structures, hull energy etc) and the fact that AFLOW is disabled by default also confirm this. Will be removing aflow querier from next push.

[pedrobcst]

Closed as of commit f664866