Eliminate MixedCaps symbol from public JTAG TAP API:

- Purely mechanical transformations to the source files.
- Rename 'jtag_NextEnabledTap' as 'jtag_tap_next_enabled.'


git-svn-id: svn://svn.berlios.de/openocd/trunk@2069 b42882b7-edfa-0310-969c-e2dbd0fdcd60