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/Task.cpp

@@ -505,7 +505,7 @@ std::string Task::composeJSON (bool include_id /*= false*/) const
       out << "\""
           << i->second.name ()
           << "\":\""
-          << JSON::encode (i->second.value ())
+          << json::encode (i->second.value ())
           << "\"";
 
       ++attributes_written;
@@ -530,7 +530,7 @@ std::string Task::composeJSON (bool include_id /*= false*/) const
         out << "{\"entry\":\""
             << d.toISO ()
             << "\",\"description\":\""
-            << JSON::encode (i->second.value ())
+            << json::encode (i->second.value ())
             << "\"}";
 
         ++annotations_written;