- adds two speeds to jtag_speed. reset and post reset speed. Default

is post reset = reset speed.
- removed infinite loop's and exit()'s upon poor arm7/9 communication
- cleaned up error messages a bit. Push ERROR() up into fn's that
  fail and can say something meaningful about what failed.


git-svn-id: svn://svn.berlios.de/openocd/trunk@511 b42882b7-edfa-0310-969c-e2dbd0fdcd60