Lexer

- Lexer now makes a speculative legacy dateformat parse whenever it encounters
  a decimal digit.  This assumes that rc.dateformat begins with a numeric date
  element, which is a restriction, but not a big one.

src/Lexer.h

@@ -33,6 +33,8 @@
 class Lexer
 {
 public:
+  static std::string dateFormat;
+
   enum Type
   {
     typeNone = 0,