backport some openxlsx commits

[JanMarvin]

There is quite a large backlog from commits to openxlsx. Even though we kinda reworking mostly everything in this package, it might be useful to port over a few changes.

[JanMarvin]

merged since the fork

• https://github.com/ycphs/openxlsx/pull/276 (required?)

• https://github.com/ycphs/openxlsx/pull/311 (conditional formatting for containsBlanks/notContainsBlanks) while we're at this we could add the following

  • aboveAverage
  • containsErrors
  • iconSet
  • notContainsErrors
  • timePeriod
  • top10
  • uniqueValues

• https://github.com/ycphs/openxlsx/commit/9ac85e7d6ad3756ec051a23d23aae3e6b5ddbae1 (fixes a bug, which bug? can we test this, can we fix this for good?)

pending PR

• https://github.com/ycphs/openxlsx/pull/341 (merge non unique cells column and or rowwise?)

[JanMarvin]

guess we have everything we need and this is already old and outdated