Describe -T. Sync SYNOPSIS with options. Sort options.
Remove trailing whitespace. Use more markup.
Sync usage with man page.
Fix inverted logic of card_detect_n bit, from FUKAUMI Naoki <fun@naobsd.org>.
MMC0/VBUS GPIO changes for Radxa Rock, from FUKAUMI Naoki <fun@naobsd.org>.

XXX Need to find a way to handle board-specific configurations.
Slowly bring this thing kicking and screaming into the 21st century:

- use struct disk_geom
- add wedge support