Add single TQObject root parent for all TDEIO::Job objects.

This helps keeping the object root list shorter, speeding up operations
which require lot of TQObject trees. This relates to TDE/tdebase#309.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

tdeio/tdeio/job.cpp

@@ -106,7 +106,9 @@ public:
     unsigned long m_userTimestamp;
 };
 
-Job::Job(bool showProgressInfo) : TQObject(0, "job"), m_error(0), m_percent(0)
+static TQObject *__job_root_obj = new TQObject(0, "jobroot");
+
+Job::Job(bool showProgressInfo) : TQObject(__job_root_obj, "job"), m_error(0), m_percent(0)
    , m_progressId(0), m_speedTimer(0), d( new JobPrivate )
 {
     // All jobs delete themselves after emiting 'result'.