Table and longtable: alternate color rows

[Rich Shepard]

On Wed, 11 Dec 2019, Rich Shepard wrote:

> The floating table above has the header line (with wrapped cells) as two
> lines, grey and white and with a separator line. There are no separator
> lines above and below the 2-line column header row.

I removed all lines in the preamble associated with non-longtables but it
still has alternate color rows.

Rich