Highlight selected sequence diagram items.

Highlight selected sequence diagram items.

Create a new dialog each time the user follows a stream. A lot of the
follow code seems to assume one and only one dialog so there are likely
outstanding bugs.

Don't use the global cfile (should we deprecate its usage?). We want to
move closer to multiple documents, not further away.

Clean up after ourselves. Free our payload list and unlink our temp
file. Make a bunch of gchar*s QStrings. Make sure our destructor gets
called and use it.

Make member variable and method names more consistent.

svn path=/trunk/; revision=53306