Fix crash on dropping URL queries into some folder.
Fix filename on dropping URI queries into folder.

URI query http://some.site/path/query.php?new=yes&mine=0 should be never
tried to save as path/query.php?new=yes&mine=0 but as query.php instead.
Web browsers do this, libfm applications should do the same.
Correct invalid e-mail pcman@debian in Copyright lines.