Ok, I added the tests to the baseimage tests package. 
Problem: after filing in your urlWithPassword-ls changeset, I get two
failing tests:

testRelativeFTP2

        baseUrl _ 'ftp://somewhere/some/dir/?query#fragment' asUrl.
        url _ baseUrl newFromRelativeText: 'ftp:xyz'.

        self assert: url toText =  'ftp://somewhere/some/dir/xyz'. 


url toText is  'ftp://somewhere/some/dir//xyz'


testRelativeHTTP                                     


        baseUrl _ 'http://some.where/some/dir?query1#fragment1' asUrl.
        url _ baseUrl newFromRelativeText:
'../another/dir/?query2#fragment2'.
                                                             
        self assert: url toText =
'http://some.where/another/dir/?query2#fragment2'.


Url toText is  'http://some.where/some/another/dir/?query2#fragment2'
















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