Updated the Dutch translation of gaf.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
Updated the Dutch translation of gattrib.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
Updated the Dutch translation of gnetlist.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
Updated the Dutch translation of gschem.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
Updated the Dutch translation of gsymcheck.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
Updated the Dutch translation of libgeda.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
gschem: Handle non-recursive symbol directories correctly
gschem: Fix double-click behavior with overlapping objects

Closes-bug: lp-912978
gattrib: fixed some comments

They were rudiments of removed code.
gschem: fix a typo in tooltip text
libgeda: add doxygen comment for a function
gschem: fixed several typos in comments
gschem: separate rc and window initialization

One window creation function has been introduced for using
in the "file_new_window" callback and in gschem.c.

The order of initialization functions has been changed to separate
initialization of the libgeda TOPLEVEL objects and GschemToplevel
objects.

This also discovers a bug introduced in commit 5df63f0, which
consists in critical assertion while closing one of several gschem
windows after a few of them were opened using 'fw'). This takes place
due of asynchronous calls of the page_view dispose functions which may
be called both before and after deleting of its underlying page.
gschem: fix order of assertions for GschemPageView, PAGE & GschemPageGeometry objects
gschem: prevent multiple calls of gschem_page_view_set_toplevel in the page_view dispose function
gschem: don't create new pages for undo
gschem: make GschemPageView reference to PAGE instead of TOPLEVEL

This patch makes the gschem graphical system more independent of
libgeda. This will let us in the future create other structures of pages
(e.g.  projects) that will not depend on one graphical window or maybe
add more than one GschemPageView object to a window.

It also fixes several assertions described in commit 5fb9ca2.
gschem: add initialization of two toplevel variables

Irrelevant comment which had been there after various moving of code has
been deleted.
gschem: don't set "active" property for preview widget

If it is set while the object has not been realized, it warns
"assertion `GDK_IS_DRAWABLE (...)' failed".
gschem: get rid of a_zoom_extents

The functionality of that function is now in
gschem_page_view_zoom_extents.