inconsistent variable names, script names & hard-coded things

[shen4brains]

Things to clean up:

• [ ] subject directory variable naming conventions (e.g., $subjdir, $direc, $baseDir are all used to mean the same directory)
• [ ] turn off verbose mode in bb_eddy_wrap and bb_probtrackx2
• [x] rename TVB team scripts with 'tvb_' prefix (e.g., probtrackx scripts)
• [ ] rename IDP pipeline bb_IDP.py to be consistent with other subpipes

Hard-coded things to fix:

• [ ] B0 extraction in diffusion subpipe << This is an issue for the odd case where B0 isn't the first volume
• [ ] acqparams.txt contents in bb_pre_eddy

[shen4brains]

Also some typos that don't affect pipeline function:

• [ ] extra subject name argument in FEAT job submission in bb_pipeline_func in both ADNI3 and master branches

[shen4brains]

Also need to check for consistent labelling of QC report with pipeline sections (e.g., 'dMRI' not 'DTI', 'structural' not 'anatomical') @justinliuyuwang

[shen4brains]

And make logging of jobFC equivalent to other logs (missing header and footer?)