Add a root element to the xml output.
Add a root element to the xml output.

Without the root element the output isn't valid xml. Although the
output is supposed to provide a human readable representation for
internal use only, and thus never really intended for processing by
third-party applications, it doesn't hurt to turn it into valid xml
either.

glance-/libdivecomputer,glance-/libdivecomputer,Poltsi/libdivecomputer-vms,henrik242/libdivecomputer,josh-wambua/libdivecomputer,venkateshshukla/libdivecomputer,venkateshshukla/libdivecomputer,josh-wambua/libdivecomputer,henrik242/libdivecomputer