- clean up target output strings a bit

- open_file_from_path() now uses logging feature
- open_file_from_path() no longer uses paths for anything but "r" mode. Fixes 
  bug  waiting to happen.


git-svn-id: svn://svn.berlios.de/openocd/trunk@389 b42882b7-edfa-0310-969c-e2dbd0fdcd60