Code Cleanup

- Obsoleted Filter.{h,cpp}.
- Obsoleted Sequence.{h,cpp}.
- Eliminated Context::autoFilter.
- Stubbed Expression::eval.

src/commands/CmdHistory.cpp

@@ -59,8 +59,7 @@ int CmdHistoryMonthly::execute (std::string& output)
   std::vector <Task> tasks;
   context.tdb.lock (context.config.getBoolean ("locking"));
   handleRecurrence ();
-  Filter filter;
-  context.tdb.load (tasks, filter);
+  context.tdb.load (tasks);
   context.tdb.commit ();
   context.tdb.unlock ();
 
@@ -225,8 +224,7 @@ int CmdHistoryAnnual::execute (std::string& output)
   std::vector <Task> tasks;
   context.tdb.lock (context.config.getBoolean ("locking"));
   handleRecurrence ();
-  Filter filter;
-  context.tdb.load (tasks, filter);
+  context.tdb.load (tasks);
   context.tdb.commit ();
   context.tdb.unlock ();
 
@@ -388,8 +386,7 @@ int CmdGHistoryMonthly::execute (std::string& output)
   std::vector <Task> tasks;
   context.tdb.lock (context.config.getBoolean ("locking"));
   handleRecurrence ();
-  Filter filter;
-  context.tdb.load (tasks, filter);
+  context.tdb.load (tasks);
   context.tdb.commit ();
   context.tdb.unlock ();
 
@@ -594,8 +591,7 @@ int CmdGHistoryAnnual::execute (std::string& output)
   std::vector <Task> tasks;
   context.tdb.lock (context.config.getBoolean ("locking"));
   handleRecurrence ();
-  Filter filter;
-  context.tdb.load (tasks, filter);
+  context.tdb.load (tasks);
   context.tdb.commit ();
   context.tdb.unlock ();