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.cpp

@@ -56,6 +56,8 @@ Context::Context ()
 , var_overrides ("")
 , cmd ()
 , inShadow (false)
+, terminal_width (0)
+, terminal_height (0)
 {
 }