rename library v2

[luigibonati]

Description

renaming library, lightning and other stuff

[codecov]

Codecov Report

Merging #49 (5d76373) into lightning (f5a7b2f) will not change coverage.
The diff coverage is 0.00%.

[luigibonati]

List of changes:

• mlcvs --> mlcolvar
• pytorch_lightning --> lightning
• import lightning as pl --> import lightning (and pl. --> lightning.)
• lightning.callbacks --> lightning.pytorch.callbacks
• lightning.loggers --> lightning.pytorch.loggers

[luigibonati]

Both the mlcolvar/tests/test_cvs_multitask_multitask.py and DeepTDA notebook fail for tensors on different devices (in local, by default GPU is used if available)

[luigibonati]

@EnricoTrizio I think the tests are failing on GPU when TDA loss is used:

# compute loss function contributes for class i
>           loss_centers[i] = alpha*(mu - target_centers[i]).pow(2)
E           RuntimeError: Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!

[luigibonati]

@andrrizzi @EnricoTrizio I am merging this.
Note that you might have to reinstall the library
The last thing which needs to be changed is the repo name (and then also read the docs)