Document action buttons

The property window of the document (and also the Manager of documents) offer a set of action buttons.

[Refresh of document]	The document contents is refreshed.
[Refresh of picture]	The images in the document are refreshed.
[Load settings]	Settings previously saved into an external file are read.
[Save settings]	The current settings are stored into an external file.
[Save template]	The current document is saved as a new document template.