fix print of number of obs converted, and make input.nml defaults better

[nancycollins]

the convert_airs_L2 converter was printing 1 more obs converted than was actually done.

also, the settings for the convert_airs_L2 namelist thinned out all the obs. change the defaults to include all possible obs, including all latitudes, and give an example filename for input instead of a list name. the input file isn't in our repo, but it might help a user see what kind of filename they're looking for.

Description:

fix printout of number of obs converted to be right. also change namelist defaults to not thin out all obs

Fixes issue

fixes #596

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update

Documentation changes needed?

• [ ] My change requires a change to the documentation.
  • [ ] I have updated the documentation accordingly.

Tests

i built and ran this with my copy of the updated HDF_EOS libraries and it printed out the correct number of obs. it also didn't thin them all out.

Checklist for merging

• [ ] Updated changelog entry
• [ ] Documentation updated
• [ ] Update conf.py

Checklist for release

• [ ] Merge into main
• [ ] Create release from the main branch with appropriate tag
• [ ] Delete feature-branch

Testing Datasets

• [x] Dataset needed for testing available upon request - there is an AIRS hdf file in my home dir on cheyenne/derecho
• [ ] Dataset download instructions included
• [ ] No dataset needed

[nancycollins]

p.s. i linked this with the original hdf-eos library and got the 'file not found' error. i linked it with the hdf-eos.patch version of the library and it ran fine.