Support fragments in endpoint URLs

[twagoo]

If endpoint URLs in the XML configuration or in the centre registry contain an URL fragment (starting with #), it should be made sure that

• the fragment part is included when matching endpoint URLs (i.e. it should be possible to extend such an endpoint from the centre registry in the XML configuration)
• multiple URLs that are equal except for the fragment should be considered unequal
• only when making the request the fragment part should be discarded/ignored

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For example, it should be possible to have two URLs in the centre registry:

• https://clarino.uib.no/oai
• https://clarino.uib.no/oai#FIN-CLARIN

Notice that these are equal except for the URL fragment. However, these should be treated as separate, and if the XML configuration contains the following:

    <provider url="https://clarino.uib.no/oai#FIN-CLARIN" name="FIN-CLARIN">
      <set>FIN-CLARIN</set>
    </provider>

this should ony apply to the harvest of the second 'provider'.