Short Description: Fix to incell editing in the RPL Edit Function Args dialog.
Bug Number 5133:
Release notes (y/n): No, recent development bug.
For Release Nums: 6.1 and 6.2

Gnats 5133: RPL Edit Function Arguments: Unable to edit argument name.

Incell edits in argument name cells were not being applied when completing 
the edit by hitting Enter or clicking INSIDE the dialog box.

Apparently, this was broken on 10-02-2011 (two months ago) in a change
to QtUtils/GenListView.cpp.  A notification (Qt signal) type from the 
incell QLineEdit was changed from 'textChanged' to 'editingFinished'.
In general, that was a desirable change, and posed no problems for the
other uses of GenListView (all in DbDmi).  However QtRpl/RplArgEditDlg
doesn't use the intended notifications from GenListView, but rather, the 
lower-level signals from the base class, Q3ListView.  This will become
moot when these modules are ported to Qt4. (GenListView is implemented 
in Qt3, and we intend to replace uses of that with direct single-level
Qt4 QTreeWidget or QTreeView implementations).

The problem with the use of GenListView in QtRpl/RplArgEditDlg was that
GenListView::stopRename (bool clear) was calling blockSignals (true) on
the _editor widget -- to prevent recursive reentry (according to a comment
there), and that was preventing the edit completion from being processed in
the reported scenarios.

I recoded this to use a _stopRename_inProgress instance flag (bool) to
prevent reentry -- and added a NULL check for _edititem in
GenListView::lineEditFinished, which became necessary because of
additional processing.

Bill helped out with a review and testing of these changes in DbDmi 
dialogs (the only other uses of GenListView in RiverWare).

See changes in:
  QtUtils/GenListView.hpp
  QtUtils/GenListView.cpp

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