Rework how we open urls that have a #

Previously if it was a remote url that had # and a . after the # we
assumed the url had no fragment and everything was filename.

We don't do that anymore, what we do now is try to open the url as
parsed, i.e. before the # is the filename after is the fragment, and if
that fails we try to open everything as filename and nothing as
fragment.

Unfortunately given how kpart internals handle opening local vs remote
urls we need to do this in two places.

Also we have to remove the test that checked that the url was mangled at
the shell level because we don't do that anymore. Unfortunately can't
add a test for the new codepage since it would involve starting an http
server ^_^

Filenames:
  source2e.pdf
  foo#bar.pdf

What works:
 * okular http://localhost/source2e.pdf#subsection.68.3
 * okular file:///srv/http/source2e.pdf#subsection.68.3
 * okular source2e.pdf#subsection.68.3 (in the /srv/http folder)
 * okular source2e.pdf#2
 * okular http://localhost/foo#bar.pdf
 * okular file:///srv/http/foo#bar.pdf
 * okular foo#bar.pdf (in the /srv/http folder)

What doesn't work:
 * okular http://localhost/foo#bar.pdf#2

I think it's a fair limitation that if you want to open a file that contains # in the name and also use a # page marker you need to use the encoded url like okular http://localhost/foo%23bar.pdf#2
after all things like firefox will totally fail opening http://localhost/foo#bar.pdf and will just work if you give the encoded url

BUGS: 426976