Enhancements - Cmd object

- New Cmd object to handle localized commands, customReports and general
  command parsing.
- Localized new Subst methods.
- Relocate guess method from parse.cpp to text.cpp.
- Converted Att object to use new valid/parse scheme.
- Unit tests for Cmd object.
- Fixed att.t.cpp unit tests.

src/parse.cpp

@@ -158,38 +158,6 @@ static const char* commands[] =
 
 static std::vector <std::string> customReports;
 
-////////////////////////////////////////////////////////////////////////////////
-void guess (
-  const std::string& type,
-  std::vector<std::string>& options,
-  std::string& candidate)
-{
-  std::vector <std::string> matches;
-  autoComplete (candidate, options, matches);
-  if (1 == matches.size ())
-    candidate = matches[0];
-
-  else if (0 == matches.size ())
-    candidate = "";
-
-  else
-  {
-    std::string error = "Ambiguous ";
-    error += type;
-    error += " '";
-    error += candidate;
-    error += "' - could be either of ";
-    for (size_t i = 0; i < matches.size (); ++i)
-    {
-      if (i)
-        error += ", ";
-      error += matches[i];
-    }
-
-    throw error;
-  }
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 void guess (
   const std::string& type,
@@ -375,7 +343,7 @@ bool validDescription (const std::string& input)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-static bool validCommand (std::string& input)
+bool validCommand (std::string& input)
 {
   std::string copy = input;
   guess ("command", commands, copy);