Argument Parsing

- Added proper handling for sequences, in that they must be contiguous.
- Added placeholder code for default command, and automatic info report.
- Eliminated Context::parse.
- Eliminated Context::run Timer, because when it goes out of scope, it
  adds timing messages to the deubg output, which at the end of Context::run
  has already been displayed.  In addition, the Context::dispatch timer
  is about 0.2 milliseconds shorter, so the two are redundant.

src/commands/CmdModify.cpp

@@ -50,8 +50,8 @@ CmdModify::CmdModify ()
 ////////////////////////////////////////////////////////////////////////////////
 int CmdModify::execute (std::string& output)
 {
-  int count = 0;
 /*
+  int count = 0;
   std::stringstream out;
 
   std::vector <Task> tasks;