Initial data commit

Task/Introspection/Maxima/introspection.maxima

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+/* Get version information */
+build_info();
+/* build_info("5.27.0", "2012-05-08 11:27:57", "i686-pc-mingw32", "GNU Common Lisp (GCL)", "GCL 2.6.8") */
+
+%@lisp_version;
+/* "GCL 2.6.8" */
+
+/* One can only check for user-defined objects: functions, variables, macros, ...
+   Hence we won't check for 'abs, which is built-in, but for 'weekday, defined elsewhere on RosettaCode.
+   Here year, month and day are 2012, 05, 29. */
+
+if    subsetp({'year, 'month, 'day}, setify(values))
+and   member('weekday, map(op, functions))
+then  weekday(year, month, day)
+else  'bad\ luck;
+
+/* Sum of integer variables */
+lreduce("+", sublist(map(ev, values), integerp));