Bug fixes; get mouse working.

Fix bug in post causing PIC2 to not be initialized properly.
Only run ata_detect if CONFIG_ATA enabled.
Improve debugging aids - introduce debug_isr(); move DEBUGF to each file.
Enable mouse by default.
Fix bug in floppy causing extra test of PORT_FD_STATUS on recalibrate.
Always disable/enable kbd in handle_09 event.
diff --git a/src/config.h b/src/config.h
index a440201..a984e5c 100644
--- a/src/config.h
+++ b/src/config.h
@@ -3,10 +3,11 @@
 // Configuration definitions.
 
 #define CONFIG_FLOPPY_SUPPORT 1
-#define CONFIG_PS2_MOUSE 0
+#define CONFIG_PS2_MOUSE 1
 #define CONFIG_ATA 1
 #define CONFIG_KBD_CALL_INT15_4F 1
 #define CONFIG_ELTORITO_BOOT 0
+
 #define CONFIG_MAX_ATA_INTERFACES 4
 #define CONFIG_MAX_ATA_DEVICES  (CONFIG_MAX_ATA_INTERFACES*2)