libsbig: added sbig_close_driver()
libsbig: added open_device for LPT and ETH cameras
libsbig: added comments in handle.h
libsbig: rework camera, adding sbig_ccd_t object
libsbig: add sbig_query_cmd_status()
libsbig: add get_ccd_exposure_status()
sbig-info: update after camera api changes