Fixed that Member#destroy triggers after_destroy callbacks twice (#16795).

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Fixed that custom field referencing deleted value trigger an error on display (#16926).

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replace tabs to spaces (#16795)

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awesome_nested_set: import git 2-1-stable branch revision 606847769 (#6579)

https://github.com/collectiveidea/awesome_nested_set/commit/606847769

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awesome_nested_set: import git 2-1-stable branch revision 3d5ac746542b564 (#6579)

https://github.com/collectiveidea/awesome_nested_set/commit/3d5ac746542b564

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awesome_nested_set: import git 2-1-stable branch revision 8eaab19868f326 (#6579)

https://github.com/collectiveidea/awesome_nested_set/commit/8eaab19868f326

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awesome_nested_set: add lib/plugins/awesome_nested_set/init.rb (#6579)

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remove awesome_nested_set patch from config/initializers/10-patches.rb (#6579)

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awesome_nested_set: not use cache for max rgt (#6579)

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