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.

i18n/strings.en-US

@@ -18,7 +18,7 @@
 105 Inverted sequence range high-low
 106 ID Range too large
 107 Not a sequence.
-108 Interactive mode is only available when built with ncurses support.
+
 109 Empty record in input
 110 Unrecognized characters at end of line
 111 Record not recognized as format 4

i18n/tips.en-US

@@ -19,11 +19,6 @@ strip the trailing \n characters from the end of the file.
 If you must edit your pending.data file, make sure that your text editor doesn't
 convert from a Unix to a DOS file encoding.
 %
-Did you build task from source?  If you didn't have ncurses installed at the
-time, then you're missing out on text wrapping and task cannot take advantage of
-the full terminal width.  Consider rebuilding with ncurses installed, or install
-from a pre-built package for your OS.
-%
 Do you have the latest version of task installed?  Check http://taskwarrior.org
 periodically for news of updates.  That feature you wanted might be ready...
 %