Move swiss-bib modules to core?

[TobiasNx]

https://github.com/linked-swissbib/swissbib-metafacture-commands

swissbib has a lot of modules that are interesting for us. We should have a look and move some of them to core- e.g.

• we need open-http to page, swissbib has https://github.com/linked-swissbib/swissbib-metafacture-commands#open-multi-http
• they have encoder and decoder for ntriples
• SRU support with the mix of open-multi-http with encode-marcxml-sru https://github.com/sschuepbach/metafacture-examples/blob/master/Swissbib-Extensions/Swissbib-SRU/sru.flux

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