Provide more informative names for Dirichlet-Multinomial parameters

[k-doering-NOAA]

See more comments in #183 . Here is one suggestion:

Couldn't you use a delimiter and just paste the fleets together if there are multiple? e.g., ln(DM_theta)_Age_P7(2-3-4)
For what it is worth, I like the correct mathematical notation of ln(DM_theta) because it helps the visually impaired when a screen reader is reading the output. I think there are ways in tidyverse to accommodate the parenthesis, at least you can with backticks but I think there are other ways as well.

Originally posted by @kellijohnson-NOAA in #183 (comment)

[k-doering-NOAA]

relates to #266

[Rick-Methot-NOAA]

I started into implementing the more informative names with the code for MV Tweedie. Some aspects of the proposed names get complicated. I do not see an easy way to list in the name all the fleets that use that parameter.

[iantaylor-NOAA]

Could we just expand the Length_Comp_Fit_Summary and Age_Comp_Fit_Summary outputs to include columns for the parameter labels?

Perhaps you've already implemented changes to this table for MV Tweedie, but it occurs to me that it could be expanded from this status-quo format:

Age_Comp_Fit_Summary
Factor	Fleet	Recommend_var_adj	#	N	Npos	min_Nsamp	max_Nsamp	mean_Nsamp_in	mean_Nsamp_adj	mean_Nsamp_DM	DM_theta	mean_effN	HarMean_effN
5	1	1	#	47	47	13	1440	473.255	473.255	215.072	0.829148	1273.44	70.6253
5	2	1	#	14	14	46	105	69.5	69.5	64.3659	12.3422	284.77	32.8397

to something like

Age_Comp_Fit_Summary
Factor	Fleet	Recommend_var_adj	#	N	Npos	min_Nsamp	max_Nsamp	mean_Nsamp_in	mean_Nsamp_adj	mean_Nsamp_DM	weight_par1	weight_par2	weight_Label1	weight_Label2	mean_effN	HarMean_effN
5	1	1	#	47	47	13	1440	473.255	473.255	215.072	0.829148	NA	ln(DM_theta)_1	NA	1273.44	70.6253
5	2	1	#	14	14	46	105	69.5	69.5	64.3659	12.3422	NA	ln(DM_theta)_2	NA	284.77	32.8397

where both weight_Par and weight_Label values would be NA for the multinomial likelihood, the 2nd one would be NA for the DM, and both would have meaning for the MV Tweedie.

That would make it easy to match each fleet with the parameter.

[Rick-Methot-NOAA]

Good suggestion Ian.