comment class feature; VC6 namespace bug workaround

I thought I would contribute a small feature/bug fix that made my life a
bit easier. It is in regards to the comment class, specifically:

    cout << b("Some text in bold");             // works
    cout << comment("Some text in a comment");  // does not work

I fixed it as follows, in HTMLClasses.h:

--------------------------
 /*! \class comment HTMLGeneric.h cgicc/HTMLGeneric.h
  * \brief An HTML comment
  */
 class comment : public HTMLBooleanElement<nullTag>
 {
+public:
+  comment() { }
+  comment(const STDNS string& text)
+    : HTMLBooleanElement<nullTag>(text)
+  { }
+private:
   virtual void render(STDNS ostream& out) 	const
   {
     if(getData().empty() && dataSpecified() == false) {
       swapState();
       out << (getState() ? "<!-- " : " -->");
---------------------------

Secondly, there is a problem with the Standard C++ Library
implementation in Microsoft Visual C++ 6.0. Some of the stdc++ headers
which are supposed to include standard C headers under the namespace std
apparently do not do their job, and simply include the symbols from
those headers in the global namespace, causing the errors

    CgiInput.cpp(55) : error C2039: 'getenv' : is not a member of 'std'
    CgiInput.cpp(55) : error C2440: 'initializing' : cannot convert from
'[string]' to 'char *'

I think this is a bug, considering this is counter to the MSDN
documentation of these headers. The problem is well known to me, and is
also illustrated by the fact that a file containing only 

    #include <cstdlib>
    using namespace std;

causes a "'std' is not a namespace" error. Those having problems with
this on the help-cgicc list, I got the same error that you did on the
first go.

The following resolves this issue, from CgiInput.cpp:

----------------------------
STDNS string
CGICCNS CgiInput::getenv(const char *varName)
{
  char *var = 
// MSVC C++ 6.0 lib problem, <cstdlib> is not in std namespace
#if defined(_MSC_VER) && _MSC_VER < 1201 // hopefully they get it right
next time
              STDNS 
#else // don't call the member function
                 ::
#endif
                    getenv(varName);
  return (var == 0) ? "" : var;
}
-----------------------------

It's messy but portable. The conditional might also need to be tweaked,
depending on if this bug occurs in prior versions of VC++.

I hope these small improvements are of use!

-- kyle