- try to enforce the same style to all Qt related files
- remove unneeded includes from the files
- add missing Q_OBJECT, QT_BEGIN_NAMESPACE / QT_END_NAMESPACE
- prepares for a pull-req to include Qt5 compatibility
- instead of "return false;" use "return QDialog::eventFilter(object,
event);" to harmonize this event filter with our default behaviour
- remove orphan spaces found while editting the files
