DSK image loading considered slow, Use NIB image for faster tests (not specifically exercising DSK codepaths)

- There may be some wins in optimizing the DSK codepaths, but I think these are inherently slow now that we have
      brought in Applewin's conformant code
    - It's possible that the best option will be to bring back the non-conformant-but-faster DSK codepaths originally in
      this emulator but ...

Makefile.am

@@ -150,8 +150,8 @@ shaders_DATA = src/video/Basic.vsh src/video/Basic.fsh
 disksdir = @datadir@/@PACKAGE@/disks
 disks_DATA = \
 	disks/README disks/blank.dsk.gz disks/blank.nib.gz disks/blank.po.gz disks/etc.dsk.gz \
-	disks/mystery.dsk.gz disks/speedtest.dsk.gz disks/speedtest.txt \
-	disks/flapple140.po.gz disks/testdisplay1.dsk.gz disks/testvm1.dsk.gz
+	disks/mystery.dsk.gz disks/speedtest.dsk.gz disks/speedtest.txt disks/flapple140.po.gz \
+	disks/testdisplay1.dsk.gz disks/testdisplay1.nib.gz disks/testvm1.dsk.gz disks/testvm1.nib.gz
 
 
 # Extra distribution stuff

src/test/testdisplay.c

@@ -25,7 +25,7 @@ static void testdisplay_teardown(void *arg) {
 }
 
 TEST test_boot_disk() {
-    test_setup_boot_disk("testdisplay1.dsk.gz", 1);
+    test_setup_boot_disk("testdisplay1.nib.gz", 1);
 
     BOOT_TO_DOS();
 

src/test/testvm.c

@@ -13,7 +13,7 @@
 
 #define RESET_INPUT() test_common_setup()
 
-#define TESTING_DISK "testvm1.dsk.gz"
+#define TESTING_DISK "testvm1.nib.gz"
 
 #define TYPE_TRIGGER_WATCHPT() \
     test_type_input("POKE7987,255:REM TRIGGER DEBUGGER\r")