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/Context.h

@@ -99,6 +99,9 @@ public:
   std::vector <std::string> footnotes;
   std::vector <std::string> debugMessages;
   bool                      inShadow;
+
+  int                       terminal_width;
+  int                       terminal_height;
 };
 
 #endif