Use correct `$exclude` variable (rather than `$r`) in `BP_Core_User::get_users_by_letter()`. Fixes ability to query for users by `letter` and also exclude certain users.

Querying for users by letter has not been used in BuddyPress's template parts since 1.2, but is still actively supported for other plugins and themes to use.



git-svn-id: https://buddypress.svn.wordpress.org/trunk@8558 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Messages: soft-deprecate existing autocomplete CSS/JS by moving assets into deprecated folder.

Functionality hasn't been changed, the scripts have just been moved. Eventually, these will be
replaced by a newer auto-suggest JS/UI, then these will be used just for backwards compatibility
with old themes.

See #3278 and #5735.


git-svn-id: https://buddypress.svn.wordpress.org/trunk@8559 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
When a user changes her email address, require email verification of the new address

This feature, built into WordPress MS by default (when updating one's profile
via the Dashboard), ensures that new email addresses are valid and not
mistyped, helping to avoid unintentionally locked-out accounts.

Fixes #2265

Props j.conti for an initial patch

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8560 cdf35c40-ae34-48e0-9cc9-0c9da1808c22