Clean up the core JTAG TAP APIs:

- Move jtag_tap_name to same location as other TAP functions; export it.
- Factor new jtag_tap_add() from jim_newtap_cmd(); appends TAP to global list.
- Move static chain position counter to global; use in jtag_NumTotalTaps().
- Use jtag_AllTaps for reading tap list, instead of accessing global directly.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2055 b42882b7-edfa-0310-969c-e2dbd0fdcd60