Issue812 sib first day loadlog

[jhmigueles]

Fixes #812 => minor addition to make the column identification for the advanced sleeplog case insensitive.

Checklist before merging:

• Existing tests still work (check by running the test suite, e.g. from RStudio).
• Added tests (if you added functionality) or fixed existing test (if you fixed a bug).
• Updated or expanded the documentation.
• Updated release notes in inst/NEWS.Rd with a user-readable summary. Please, include references to relevant issues or PR discussions.
• Added your name to the contributors lists in the DESCRIPTION and CITATION.cff files.

[codecov-commenter]

Codecov Report

Merging #818 (cb04489) into master (949b175) will not change coverage.
The diff coverage is 100.00%.

❗ Current head cb04489 differs from pull request most recent head c623fac. Consider uploading reports for the commit c623fac to get more accurate results

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@@           Coverage Diff           @@
##           master     #818   +/-   ##
=======================================
  Coverage   74.15%   74.15%           
=======================================
  Files          92       92           
  Lines       11665    11665           
=======================================
  Hits         8650     8650           
  Misses       3015     3015           

Impacted Files	Coverage Δ
R/g.loadlog.R	88.00% <100.00%> (ø)

[vincentvanhees]

Looks good, thank you!