LikeNotepad

This is a simple change set for using a workspace more like a notepad:

- remove append of 'Workspace from ' in FileList>>viewContentsInWorkspace
- only add '.text' in TextEditor>>saveContentsInFile when the suggestedName do not have '.text'.

otherwise if you change the file and then save it, you need to cut the extra 'Workspace from ' or '.text'.

What is not changed is the name of the original window, so if you start with a new workspace, then save the file, the title of the window remains as 'Workspace'.