fixes & enhandcements

(benchmark code..) implemented
repl completion very first version
(string xx) added
some builtin renames
a bit of comments
a bit of cocumentation
(sleep interval) added

ml.h

@@ -9,6 +9,18 @@
 
 const std::string VERSION = "mi 0.1 (" __DATE__ " " __TIME__ ")";
 
+const std::string STDLIB_LOADER =
+	 R"( (define ___lib_path '("/usr/local/var/mlisp"))
+			(for d ___lib_path
+				(if (is-dir? d)
+					(for f (ls-dir d)
+						(if (string-regex? f "^.*\.l(i)?sp$")
+							(include (+ d "/" f))
+							'())
+					)
+					'()))
+		)";
+
 
 // Forward declaration for MlEnvironment class definition
 class MlValue;
@@ -32,6 +44,9 @@ public:
     // Set the value associated with this name in this scope
     void set(const std::string &name, MlValue value);
 
+    // Get vector of executables in this scope
+    std::vector<std::string> get_lambdas_list() const;
+
     void combine(MlEnvironment const &other);
 
     void set_parent_scope(MlEnvironment *parent) {
@@ -153,6 +168,9 @@ public:
     // Cast this to a floating point value
     MlValue cast_to_float() const;
 
+    // Cast this to a string
+    MlValue cast_to_string() const;
+
 
     bool operator==(MlValue other) const;