some tabs to spaces

cd src
    grep -P -n '\t' *.c | grep -v "1:"
    cd ../include
    grep -P -n '\t' *.h | grep -v "1:"
    cd ..

side note: win/Qt/*.cpp are full of tabs

src/dlb.c

@@ -9,7 +9,7 @@
 #include <string.h>
 #endif
 
-#define DATAPREFIX 4		/* see decl.h */
+#define DATAPREFIX 4        /* see decl.h */
 
 #ifdef DLB
 /*