update rsn regression with the tICA regression

[cyang31]

Introduce a tICA_weighted mode which performs the following steps in one mode:

• weighted spatial regression given a group sICA spatial map;
• tICA unmix given a group tICA mixing matrix;
• single regression to generate individual tICA spatial maps.

[glasserm]

I think this looks good to me.

[cyang31]

The code redundancy is mainly because I am too lazy to dig into the dimension and stuff so I keep the same workflow as in tICA/scripts/ComputeGroupTICA.sh. Now I remove the redundancy: 1) There's no need to check the zeros since this is an inference mode without padding. 2) No need to check the subject timepoints.

[cyang31]

The latest commit has been tested without error. The log file: /media/myelin/alex/pipelines/pipeline_areal_classifier/areal_classifier/twregression_log/RSNregression.sh.o1994865