Issues/331 add bookmarking function to html output

[hhund]

• adds simple bookmarking ui elements
• adds fullUrl elements to entries of history Bundles
• adds links to the versionId elements in the html output
• adds missing search parameters to the CapabilityStatement
• adds a UI element with applicable query parameters
  The UI element is generated via an AJAX request to /metadata
• adds simple download button to the ui

closes #331

[hhund]

One thing I noticed: when deleting a bookmark directly in the bookmark list view, only the icon changes from "delete bookmark" to "add bookmark" and the bookmark stays in the list. If this is intended behavior, it works fine. I initially expected the bookmark to be removed from the list, when clicking the remove icon.

This is the intended behavior and the bookmark is actually removed from local storage. The rational is, that the user can undo a remove without having to type the entire query again. Similar to the way you can "toggle" the bookmark of the current page. I will try to give more feedback to the user: Grey or strike-through text, not sure yet.

Update: Decided on a grey link text, see 4fec9d3.