Minor Tweaks

[TomDonoghue]

Minor potential tweaks to the repository files.

Python files:

• In Python/02-GroupPSDs, the sub-selection of frequency ranges (under the 'Tuning the specparam algorithm' section) could use the trim_spectrum utility, which would be a little cleaner
• In the Python notebooks, use a output_path = Path('../Output/') like is done for the data_path
• PEP8 spacing updates: should be no space after argument assignment (eg function(a=1) not function(a = 1)).

R files:

• Updated Python code in the R markdown files to match any updates made in the Python files
• Update line length of text lines (these can be wrapped right?)
• Check and fix spacing*

*Is there a standard spacing guideline for R? One thing I find a bit visually weird is the uneven spaces around assignements within function calls (ex: function(arg= val) as opposed to func(arg=val) or func(arg = val). Looking at this guide, I think the convention would be to have a space either side, so if it's all the same, I'd update to that.

[TomDonoghue]

Updated!