Tdl updates

[eloch216]

This PR makes a few changes that are helpful when working with TDL data, and adds some other miscellaneous advice.

[codecov]

Codecov Report

❌ Patch coverage is 99.25373% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.24%. Comparing base (874a110) to head (17a4eea).
⚠️ Report is 12 commits behind head on unreleased.

Files with missing lines	Patch %	Lines
R/get_oxygen_from_preamble.R	92.85%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           unreleased     #140      +/-   ##
==============================================
+ Coverage       93.97%   94.24%   +0.27%     
==============================================
  Files             105      105              
  Lines            7331     7402      +71     
==============================================
+ Hits             6889     6976      +87     
+ Misses            442      426      -16     

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