Use writexl package for saving data file

[pwep]

• Use writexl package when saving a data file.
• Update test-DfSaveDatFile.R to use the readxl package function read_xlsx
• changes addressing but not closing #54

openxlsx is still used for generating data files from UtilOutputReportExcelFileDBMH.R and UtilOutputReportExcelFileORH.R.

[codecov[bot]]

Codecov Report

Merging #56 into developer will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           developer      #56      +/-   ##
=============================================
- Coverage      69.86%   69.85%   -0.02%     
=============================================
  Files             79       79              
  Lines           9815     9811       -4     
=============================================
- Hits            6857     6853       -4     
  Misses          2958     2958              

Impacted Files	Coverage Δ
R/DfSaveDataFile.R	87.50% <100.00%> (-0.27%)	:arrow_down:

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[dpc10ster]

I am closing this, as openxlsx is currently maintained; we can always get the history here.