Obsolete dependency python-spams

[pgunn]

The spams package, used in:

• caiman/base/movies.extract_components() if the dict_learn method_factorization setting is used instead of nmf
• caiman.behavior.behavior.online_NMF()

Is no longer maintained or packaged for modern versions of Python.

The latter function appears to be dead code. The former function is used (with this option) by the CLI demo demo_behaviour.py.

This is one of the remaining conditional imports in the codebase.

It is probably best to remove the dead fuction and the option of using dict_learn with caiman.base.movies.extract_components()

[pgunn]

In the cli_demos_refactor branch, I adjusted the CLI demo to use the nmf factorisation method instead of dict_learn; I may mix the fix for this into that branch as it'll be landing soon and I'm doing related work (really testing the CLI demos is what's finding these issues).

[pgunn]

Will be fixed when #1211 lands (fixed in that branch, where I noticed the issue while testing CLI demos)

[pgunn]

1211 landed; this is now fixed in dev.