#17 XML data needs to quote bad chars

[Aaron Seth]

Our client <-> server communications needs to make sure
to quote XML "dangerous" characters, in particular '
and " because a lot of data is sent back inside tag
attributes. (Certainly frowned upon by most real xML
hackers, I'm sure).

This problem is most noticeable when the "checknode.sh"
script returns a message with the abbreviation [can't]
where the apostrophe screws up the quoting.