Added critical section around code dealing with global variables.
Added a few comments about how ASPI is supposed to work.
Copy sense info into the correct place (right after the fixed 16-byte CDB).
Now returns target status (many Windows apps won't even look at the
sense are unless they get an error code).
Added SC_ABORT_SRB FIXME.
Added SC_GET_DISK_INFO place holder for clarity.
Updated Linux SG interface structure to include new kernel 2.2
status fields.