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/API.cpp

@@ -115,13 +115,6 @@ static int api_task_feature (lua_State* L)
 #endif
   }
 
-  else if (name == "ncurses")
-  {
-#ifdef HAVE_NCURSES
-     value = true;
-#endif
-  }
-
   else if (name == "lua")
     value = true;