Making parsing more flexible

[rhshah]

Can we get the information without using MSK-ACCESS-v1_0-probe-A_baits here:

access_utils/multiqc_prep/general_stats_parse.py

Line 255 in 0b999e9

parsed_data['MSK-ACCESS-v1_0-probe-B_baits']['MEAN_TARGET_COVERAGE']

something like:

parsed_data[something].get('MEAN_TARGET_COVERAGE')