Hooks for xprofile Add Field screen.

Until this screen uses the add_meta_box() API, these hooks will allow plugin
devs to add custom items to the xprofile field creation process.

Props svenl77.
Fixes #5917.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9075 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Make "no members found" message on group members page more general.

'No members were found.' applies both when the group has no members and when
a search within group members returns no members.

Fixes #5935.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9076 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Bump version in bp-loader.php stub to 2.2-alpha.

Props ev3rywh3re.
Fixes #5937.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9077 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Add hook documentation to bp-activity-admin.php.

Props tw2113.
See #5938.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9078 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Hook documentation for bp-activity-actions.php.

Props tw2113, espellcaste.
Fixes #5936.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9079 cdf35c40-ae34-48e0-9cc9-0c9da1808c22