- removed a raft of unecessary exit() calls. Issuing a reset will solve these ails.

- now uses jtag_state_pathmove() instead of making assumptions about implementation of jtag_statemove().
- fixed a couple of bugs in timeout handling
- removed megabytes of log output when communication is failing.
- sleep is now 300ms as documented instead of 3000ms
- fixed error path of bulk write
- debug_handler can now be issued during normal operation + has help text.
Thanks Øyvind Harboe

git-svn-id: svn://svn.berlios.de/openocd/trunk@304 b42882b7-edfa-0310-969c-e2dbd0fdcd60