Improve encapsulation of JTAG event handling:

- Move nvp_jtag_tap_event and jtag_tap_handle_event to tcl.c.
- Change both to be static; remove declaration of function from jtag.h.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2166 b42882b7-edfa-0310-969c-e2dbd0fdcd60