feat: creating new mx_ suite of macros!

also adding new mx_getcode macro

tests/base/mp_reseterror.test.sas

@@ -0,0 +1,23 @@
+/**
+  @file
+  @brief Testing mp_reseterror macro
+
+  <h4> SAS Macros </h4>
+  @li mp_assert.sas
+  @li mp_reseterror.sas
+
+**/
+
+
+/* cause an error */
+
+lock sashelp.class;
+
+/* recover ? */
+%mp_reseterror()
+
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=Checking error condition was fixed,
+  outds=work.test_results
+)