update some icnons of the gui * files-dock-widget.cc (constructor): new icons for new folder selection and for searching in/for files * file-editor.cc (construct): new icons for file open and find actions * find-dialog.cc (constructor): new widget icons * main-window.cc (construct_file_menu): new icons for file open action; (construct_toolbar): new icon for selecting new octave directory * libgui/src/module.mk, resource.qrc: removed icons: chat.png, help_index.png, jabber_protocol.png, question.png, star.png, stop.png, terminal.png new icons: findf.png, folder_documents.png, folder.png * icon_files: update list of icons used from the Crystal Project, update link to its license, add a list of icons created by the octave developpers * chat.png, help_index.png, jabber_protocol.png, question.png, star.png, stop.png, terminal.png: removed icon files * findf.png, folder_documents.png, folder.png: new icon files

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