Don't swap '[User Set]' into welcome emails when accounts are created in the Dashboard

This is incorrect behavior, because when the emails are created when is_admin(),
the password is not set by the user.

The is_admin() exception was mistakenly removed in r6439.

Fixes #5466

Props SergeyBiryukov

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8137 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Use closest() instead of parent() to hide unfavorited activity item

Ancestor-crawling makes for inflexible javascript, which makes for sad developers.

Fixes #5467

Props hnla

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8138 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Check the right capabilities are used in the BP_Admin class

The introduction of the link "About BuddyPress" within the WP Admin Bar revealed that in multisite configurations, some administration menus were accessible to regular administrators when they should be restricted to the Super Administrator.
Now, the capacity used in these menus will be adapted to the configuration in which BuddyPress evolves using a "network" capacity when necessary.

props johnjamesjacoby, boonebgorges, imath

Fixes #5465

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8140 cdf35c40-ae34-48e0-9cc9-0c9da1808c22