Fix issues #425, #426, #427 and #428

[TimG1964]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 93.40278% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.24%. Comparing base (fcdba31) to head (7de5423).
⚠️ Report is 60 commits behind head on master.

Files with missing lines	Patch %	Lines
src/write.jl	89.32%	11 Missing ⚠️
src/styles.jl	89.58%	5 Missing ⚠️
src/workbook.jl	91.66%	2 Missing ⚠️
src/sst.jl	97.72%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #429      +/-   ##
==========================================
- Coverage   94.62%   94.24%   -0.39%     
==========================================
  Files          21       24       +3     
  Lines        7056     8029     +973     
==========================================
+ Hits         6677     7567     +890     
- Misses        379      462      +83     

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