Fixed bugs that were preventing NVR and Flash files from behind saved;

A lot of clean ups from waltje;
Start of a directory structure for the code, thanks to waltje.

src/scsi.h

@@ -208,7 +208,7 @@ extern int cd_status;
 extern int prev_status;
 
 #define SCSI_NONE 0
-#define SCSI_HDD 1
+#define SCSI_DISK 1
 #define SCSI_CDROM 2
 
 #define MSFtoLBA(m,s,f)  ((((m*60)+s)*75)+f)
@@ -266,4 +266,4 @@ void scsi_hd_request_sense_for_scsi(uint8_t id, uint8_t *buffer, uint8_t alloc_l
 void scsi_hd_command(uint8_t id, uint8_t *cdb);
 void scsi_hd_callback(uint8_t id);
 
-#endif
+#endif