first usable version of kernel and commands

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

qa/lib/c/sysfatal.c

@@ -0,0 +1,9 @@
+
+#include <u.h>
+#include <libc.h>
+
+void
+main(void)
+{
+	sysfatal("%c%c%c%s", 'P', 'A', 'S', "S");
+}