PrePARE is having issues handling handling cell_methods values containing multiple comments

[mauzey1]

The values for the cell_methods can contain comments within parentheses.

 "cell_methods": "longitude: sum (comment: basin sum [along zig-zag grid path]) depth: sum time: mean", 

However, some of the files generated by CMOR can create values with multiple parentheses sections.

htovgyre:cell_methods = "longitude: sum (comment: basin sum [along zig-zag grid path]) depth: sum time: mean (interval: 1 month)"

PrePARE is currently only designed to handle removing one parentheses section. Having multiple sections will cause everything from the first starting parenthesis to the last ending parenthesis to be removed. This will then cause an error when comparing the values between the CMIP6 table and the dataset.

=====================================================================================
Your file contains "cell_methods":"longitude: sum" and
CMIP6 tables requires "cell_methods":"longitude: sum depth: sum time: mean".
=====================================================================================

I have made a change to the regex that handles removing the comment sections correctly. I will create a PR for it shortly.