Collective.querynextprev

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- Nothing changed yet.

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- Fix this package in combination with collective.solr when filters on
dates are used
[mpeeters]

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- Remove useless keys from faceted query ('facet.field', 'b_size', 'b_start').
[sgeulette]

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- Add in registry a maxresults parameter to avoid rendering viewlet when query returns too many results.
Performance optimization.
[sgeulette]

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- Corrected failing tests of previous release.
[sgeulette]

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- Query can contain utf-8 chars.
[sgeulette]