These commands take optional arguments with () and [],
which can lead to problems if the content of the table
cell begins with these characters.
Closes#8001.
Previously we used our own homespun formatting. But this
produces over-long lines that aren't ideal for diffs in tests.
Easier to use something off-the-shelf and standard.
Closes#7580.
Performance is slower by about a factor of 10, but this isn't
really a problem because native isn't suitable as a serialization
format. (For serialization you should use json, because the reader
is so much faster than native.)
In recent versions the table headers were no longer bottom-aligned
(if more than one line). This patch fixes that by using minipages
for table headers in non-simple tables.
Closes#7347.
In 2.11.3 we started adding `\addlinespace`, which produced less
dense tables. This wasn't an intentional change; I misunderstood
a comment in the discussion leading up to the change. This commit
restores the earlier default table appearance.
Note that if you want a less dense table, you can use something like
`\def\arraystretch{1.5}` in your header.
Closes#6996.
Note that the multirow package is needed for rowspans.
It is included in the latex template under a variable,
so that it won't be used unless needed for a table.
