Collective.multisearch

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- Nothing changed yet.

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- Fix max_length float/int conversion for Plone 6. [f.vandijk]

- Use Bootstrap classes and Plone 6 search results and fields construction in analogy with standard site search. [in.vandenbroeck]

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- Register a bundle in the resource registry instead of using portal_css. [maurits]

- Use the configuration registry instead of portal_properties. [maurits]

- Fixed zope.component ImportErrors in Plone 6. [maurits]

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- Updated to Plone 5.2 and Python 2/3.
TODO: load css, and replace portal_properties use with registry.
[maurits]

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- Catch socket errors when requesting a remote search source. If we don't the
whole search results page fails with an error/traceback. [fredvd]

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- Don't double urlquote the parameters in the link to more search results in
the local search portlet. [fredvd]