Feature #408 - Allow deletion of annotations.

- Added new denotate command
- Added unit tests in denotate.t
- Change task.1 man page

src/main.h

@@ -77,6 +77,7 @@ int handleStart (std::string &);
 int handleStop (std::string &);
 int handleColor (std::string &);
 int handleAnnotate (std::string &);
+int handleDenotate (std::string &);
 int handleDuplicate (std::string &);
 void handleUndo ();
 #ifdef FEATURE_SHELL