feat: reserved the function names hpl_ and mpl_.

- These names are now preserved for future numerical evaluation support.

Author: cbmarini

sources/ftypes.h

@@ -478,7 +478,9 @@ typedef int (*TFUN1)();
 #define AGMFUNCTION 122
 #define GAMMAFUN 123
 #define EXPFUNCTION 124
-#define MAXBUILTINFUNCTION 124
+#define HPLFUNCTION 125
+#define MPLFUNCTION 126
+#define MAXBUILTINFUNCTION 126
 #else
 #define MAXBUILTINFUNCTION 115
 #endif

sources/inivar.h

@@ -253,6 +253,8 @@ static struct fixedfun {
 	,{"agm_"        ,0 ,0             ,0               ,0} /* AGMFUNCTION */
 	,{"gamma_"      ,0 ,0             ,0               ,0} /* GAMMAFUN */
 	,{"eexp_"       ,0 ,0             ,0               ,0} /* EXPFUNCTION */
+	,{"hpl_"        ,0 ,0             ,0               ,0} /* HPLFUNCTION */
+	,{"mpl_"        ,0 ,0             ,0               ,0} /* MPLFUNCTION */
 #endif
 };