Update docs for most of the remaining commands in jtag.c:

 - switch to @deffn
 - these are just the "low level" JTAG commands
 - resolve much goofage!
    * remove docs for non-existent commands
    * add missing docs for some existing commands
    * fix incorrect docs for some commands
 - just index TAP states overall, not individually
 - current name is "RUN/IDLE" not "IDLE"

Cross checked against the source.

This also creates an "Interface Drivers" section, analagous to how
(NOR) Flash and NAND drivers are presented; that's not yet sorted.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2014 b42882b7-edfa-0310-969c-e2dbd0fdcd60