first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

qa/lib/c/va_copy.c

@@ -0,0 +1,20 @@
+#include <u.h>
+#include <libc.h>
+#include <stdio.h>
+
+void
+main(){
+	char *correct="0.987650\n";
+	static char result[128];
+
+	sprintf(result, "%f\n", 0.98765f);
+
+	if(!strcmp(result, correct)){
+		print("PASS\n");
+		exits("PASS");
+	}
+	else{
+		print("FAIL\n");
+		exits("FAIL");
+	}
+}