OAI 2.1

h2. Bug fixes:

* Default context without restricted items
* Solr Timezone
* DS-1902
* DS-1898

h2. New Features:

* Operators over filters (combination of filters) - foundation work for OpenAIRE guidelines v3.
* Redesigned interface
* Descriptions for contexts
* Root context (/oai) now displays the list of available contexts

h2. Other:

Using new XOAI 3.2.7 core