Code Cleanup

- Addressed valgrind complaints by freeing allocations for commands and columns.
  This leaves one complaint about getpwuid, which is either an optional free,
  or not valid, depending on OS.  (Thanks to Bryce Harrington).

src/ViewTask.cpp

@@ -56,6 +56,16 @@ ViewTask::ViewTask ()
 {
 }
 
+////////////////////////////////////////////////////////////////////////////////
+ViewTask::~ViewTask ()
+{
+  std::vector <Column*>::iterator i;
+  for (i = _columns.begin (); i != _columns.end (); ++i)
+    delete *i;
+
+  _columns.clear ();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 //   |<---------- terminal width ---------->|
 //