flash verify_image and flash erase_address.
- added patch for new parport_write_on_exit command.
Even this patch will fix some memory leaks.

(thanks too oyvind and Spen for these patches)

git-svn-id: svn://svn.berlios.de/openocd/trunk@240 b42882b7-edfa-0310-969c-e2dbd0fdcd60