Eliminated ncurses

- Removed autoconf ncurses detection.
- Modified man pages.
- Inserted vitapi replacement code.
- Cached terminal size values for reuse.
- Modified packaging info for OSX.
- Removed -lncurses from unit test makefile.
- Removed obsolete taskrc example.
- Modified (simplified) source build instructions.

src/diag.cpp

@@ -47,10 +47,6 @@ extern "C"
 }
 #endif
 
-#ifdef HAVE_LIBNCURSES
-#include <ncurses.h>
-#endif
-
 extern Context context;
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -118,18 +114,6 @@ void handleDiagnostics (std::string& outs)
 
   std::cout << "Libraries\n";
 
-  // NCurses.
-  std::cout << "   NCurses: "
-#ifdef HAVE_LIBNCURSES
-            << NCURSES_VERSION
-            << " ("
-            << NCURSES_VERSION_PATCH
-            << ")"
-#else
-            << "n/a"
-#endif
-            << "\n";
-
   std::cout << "  Readline: "
 #ifdef HAVE_LIBREADLINE
             << std::setbase (16) << RL_READLINE_VERSION