replaced facttest.lua with fibtest.lua

Optimized the NaN box to be byte aligned, performance under the fibtest.lua script improved by ~2.5 seconds (~31 before ~28.5 after on cpunch's machine)
also cleaned up some misc. comments

src/cparse.c

@@ -360,7 +360,7 @@ static void alignStack(CParseState *pstate, int alignment) {
     pstate->compiler->pushedValues = alignment;
 }
 
-// ================================================================ [PRATT'S PARSER] ================================================================
+// ================================================================ [PARSER] ================================================================
 
 static void number(CParseState *pstate, bool canAssign) {
     cosmo_Number num = strtod(pstate->previous.start, NULL);