Draft: [#3052574] Facets AJAX

Combine all of the compatible contributions into a working branch to allow easy review and continued work on the issue.

Please "fix conflicts+rebase 2.0.x" instead of merging in 2.0.x to avoid breaking history to a point that automated rebase no longer works.

mentioned in merge request !113

mentioned in merge request !26

added 8 commits

• 7357a430...c5eb3a4c - 2 commits from branch project:2.0.x
• da56ca91 - [#3052574] Facets AJAX; patch #187
• b78429d6 - [#3052574] Add session to response if it exists.
• 882dc5ef - [#3052574] url.pathname change from #178
• bceb54d8 - [#3052574] baseUrl change from MR!113
• 785fe071 - [#3052574] Pick test fixes from MR!113
• 54375cd9 - Fix indenting. Minor CS.

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added 4 commits

• 54375cd9...ac3a42c8 - 3 commits from branch project:2.0.x
• 8a92ef75 - Merge remote-tracking branch 'origin/2.0.x' into 2.0.x-3052574-ajax

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added 23 commits

• 8a92ef75...cfdcac8c - 17 commits from branch project:2.0.x
• 9b93a60c - [#3052574] Facets AJAX; patch #187
• c1686ac3 - [#3052574] Add session to response if it exists.
• 54074f9d - [#3052574] url.pathname change from #178
• dfc73c2f - [#3052574] baseUrl change from MR!113
• 40abf8f8 - [#3052574] Pick test fixes from MR!113
• 995bd75a - Fix indenting. Minor CS.

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added 4 commits

• 995bd75a...5993b7a2 - 3 commits from branch project:2.0.x
• bcd4e05c - Merge remote-tracking branch 'origin/2.0.x' into 2.0.x-3052574-ajax

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added 2 commits

• d02aef49 - 1 commit from branch project:2.0.x
• 109495a5 - Merge remote-tracking branch 'origin/2.0.x' into 2.0.x-3052574-ajax

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