write_matrix_sheet: Write out a worksheet containing one group of error rate...
In abelew/Rerrrt: Examine RT error rates through sequencing.

This function is responsible for writing out the actual data. Most of the logic in it is in an attempt to properly space the various tables and plots apart.

write_matrix_sheet(
  retlst,
  wb,
  table_names,
  sheet = "raw",
  table_type = "matrices"
)

`retlst`	Set of results from create_matrices()
`wb`	Workbook to write.
`table_names`	The set of tables to write.
`sheet`	Name of the sheet to write.
`table_type`	I have a few different tables for each metric, raw, cpm, cpmlength, etc. Choose one.