Enhancement - Context

- Context is now a global variable, otherwise it will end up being
  passed to every function, which is essentially the same as global,
  and will create a horrible coupling problem.

src/task.cpp

@@ -50,6 +50,8 @@
 #include <ncurses.h>
 #endif
 
+Context context;
+
 ////////////////////////////////////////////////////////////////////////////////
 static std::string shortUsage (Config& conf)
 {
@@ -317,9 +319,6 @@ int main (int argc, char** argv)
   srand (time (NULL));
 #endif
 
-  // TODO 1.8.0 requires the Context.
-  Context context;
-
   try
   {
     context.initialize (argc, argv);