* XML.toEntities: changed type to Text -> Text.
* Shared.tabFilter -- fixed so it strips out CRs as before.
* Modified writers to take Text.
* Updated tests, benchmarks, trypandoc.
[API change]
Closes#3731.
Some of the benchmarks were failing due to references to files in the
`tests` directory, which is now called `test`. A search found other
references to it also. This commit updates all these references.
