1. Add `<map>` to the html blocks we know about.
 2. Redo most of the test cases so they won't
    use `grep` except in exceptional cases.
 3. To prettify the test case output, modify
    `cols.c` so that it more-properly handles
    utf-8 characters.
 4. Make autolink hew closer to the reference (reddit)
    implementation.
 5. Fix a bug in generate.c where `MKD_NO_EXT` was not being handled.
 6. Add -fext to the options for the markdown program
 7. [Plan9] documentation corrections from [Josh Wood]
 8. Find and fix a bug where a url with an embedded double quote
    is printed out with that doublequote in plaintext.
 9. Some more code primping to make [anal-compulsive pseudo-C
    compilers](abbr:gcc) stfu.
10. Redo `puturl()` and the url grabbers to do debackslashification
    in `puturl()`