[fix] Advanced search: OperatorMenu, field picker, tree indent

[re1ro]

• [x] ModalPicker: handling multi-select data when adding filters
• [x] OperatorMenu: showing the right join for the wrap button
• [x] Search tree indent: preserving the path while indenting the group node

[decrapifier]

	Warnings
:warning:	The README has not been updated. Please update the README.
:warning:	Branch being merged does not follow [Git Flow](http://nvie.com/posts/a-successful-git-branching-model/)

	Messages
:book:	Could not find any browser results.

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