[TxMt] UI suggestion for tabbed file names

[Dave Baldwin]

The file tabs are annotated with a dot or cross to show if the file  
has been edited.  I find I have to read the tabs to find dirty files  
rather than just seeing then automatically.

I don't think the correspondence of dot and cross to edited and un- 
edited is obvious or natural and it would be better to no show any  
annotation  for un-edited files.  Colouring the name of edited files  
would also make it much easier to see at-a-glance if something was  
dirty.

Dave.