Two model input settings that aren't supported

I finally took some time to work on issues identified by @JuanMatiasBraccini while testing the changes in PR https://github.com/nmfs-ost/SSMSE/pull/234 (now merged to the main branch).

I found 2 issues that caused problems (but informative error messages weren't being reported so it took some digging).

1. the month (formerly seas) column in the CPUE input gets converted from 1 to 7 between the input data file and the data_echo.ss_new file and this mismatch causes problems in the check_avail_dat() function. Changing the input file to use month = 7 fixed it but a better error would be helpful.
2. there are time-varying CPUE parameters with AUTOGEN = 0 in the control file. The AUTOGEN setting gets changed but the required parameter lines don't get added, causing an error. Copying the time-varying parameters from control.ss_new into the original input fixed the issue but a better solution would be helpful.

@JuanMatiasBraccini, let me know if you have any problems with these work-arounds or if they don't get the revised SSMSE working for you.

Start by reproducing the two cases described in the issue and compare the input data with data_echo.ss_new and control.ss_new. Inspect check_avail_dat() and the handling of time-varying CPUE parameters with AUTOGEN = 0. Done means both inputs are handled correctly and failures report an informative error instead of requiring manual workarounds.