don't use gtk-specific icon names

Ccs/pixmap/document-open-folder.svg

Ccs/pixmap/document-save.svg

Ccs/pixmap/edit-clear.svg

Ccs/pixmap/edit-paste.svg

Ccs/pixmap/format-justify-fill.svg

Ccs/pixmap/media-playback-stop.svg

Ccs/pixmap/media-record.svg

Ccs/pixmap/text-x-python.svg

Ccs/pixmap/x-office-spreadsheet.svg

Ccs/plotter.py

Ccs/poolview_sql.py

Tst/tst/tst.py