Improve handling of absence in sustained inactivity bouts during first night

[vincentvanhees]

This small PR should address:

• Handle absence of sustained inactivity bouts during first night #812
• Prevent objects relating to dependency check from ending up in config file #806

fixes #812
fixes #806

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 #813 (3011cf5) into master (0aeaa63) will decrease coverage by 0.04%.
The diff coverage is 87.50%.

❗ Current head 3011cf5 differs from pull request most recent head 0e51643. Consider uploading reports for the commit 0e51643 to get more accurate results

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@@            Coverage Diff             @@
##           master     #813      +/-   ##
==========================================
- Coverage   74.02%   73.98%   -0.04%     
==========================================
  Files          90       90              
  Lines       11521    11523       +2     
==========================================
- Hits         8528     8525       -3     
- Misses       2993     2998       +5     

Impacted Files	Coverage Δ
R/g.part4.R	74.96% <83.33%> (+0.03%)	⬆️
R/GGIR.R	69.43% <100.00%> (+0.11%)	⬆️

... and 1 file with indirect coverage changes

[jhmigueles]

It works for me. The issue Mikael is reporting in the google group is related with the formatting of their sleeplog. In g.loadlog line 11, their sleeplog is misclassified as basic sleeplog because their column names state "Date" instead of "date". We can suggest them to revise that, or we can make the column names identification case insensitive by adding ignore.case = TRUE to the grep functions in g.loadlog.

[vincentvanhees]

or we can make the column names identification case insensitive by adding ignore.case = TRUE to the grep functions in g.loadlog.

Good idea, as I do not think we ever intended this to be case sensitive. I will add that now to this branch and then make the merge.