* grub-core/script/execute.c (grub_script_execute_sourcecode): Split

off new function grub_script_execute_new_scope. Change callers to use
	either of them as appropriate.
	* grub-core/commands/eval.c: New command eval.
	* docs/grub.texi (Commands): Document it.

grub-core/Makefile.core.def

@@ -703,6 +703,11 @@ module = {
   common = commands/echo.c;
 };
 
+module = {
+  name = eval;
+  common = commands/eval.c;
+};
+
 module = {
   name = extcmd;
   common = commands/extcmd.c;