JSON

- Replaced old Tree-based parser with a faster, leaner parser.
  Currently lacking good error handling and a large test suite.
- Integrated new parser into Task object, for encode/decode.
- Replicated same basic unit tests.  Needs more.
- Fixed bug in handleShell that failed to call the new Context::initialize2.
- Removed debugging code from CmdInstall.
- Implemented format() that does not require width and precision args.

src/text.h

@@ -68,6 +68,7 @@ std::string format (int);
 std::string formatHex (int);
 std::string format (float, int, int);
 std::string format (double, int, int);
+std::string format (double);
 std::string leftJustify (const int, const int);
 std::string leftJustify (const std::string&, const int);
 std::string rightJustify (const int, const int);