MANGLE_EXTENSIONS list

[Michael Masse]

Is it possible to have the MANGLE_EXTENSIONS list come from a separate
text file?     If not, I'd like to request this for a future version.   
 Upgrading is essentially painless except for when I forget to modify
the mangle extensions list to our own liking, and attachments I prefer
to have other software deal with start getting mangled all of a sudden. 
 If it was in a file this would not even be an issue.

Thanks John for making this available.

Mike