Make some adjustments to blocking behavior regarding the forums:
* Pre-existing bug: on a forum's home page (threads list), if a thread was
created by a blocked user, the thread still appeared with the user's name and
picture visible. Now: their picture and name will be "[unavailable]" but the
thread title/message and link to the thread will remain. Note: in the thread
view itself, posts by the blocked user will be missing as normal.
* Make some tweaks to allow forum moderators (and owners of user-owned forums)
able to see messages from blocked users on their forum:
* In threads: a blocked user's picture and name are "[unavailable]" but the
content of their message is still shown, and can be deleted by moderators.
Misc fixes:
* Private photos: when viewing your granted/grantee lists, hide users whose
accounts are inactive or who are blocked.
* CertifiedSince: in case a user was manually certified but their cert photo
status is not correct, return their user CreatedAt time instead.
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