Sandro Santilli 8a248696e9 Use a gopher as default avatar (rather than the gravatar logo) (#3208) ...

Also changes the avatar from a jpeg to a png, to allow for
transparent background. The indexed png is also smaller in size.

Note that at the moment the default avatar is only used when
the user requested a custom avatar and the custom avatar file
is not found (should never happen).

In the future the default avatar could be used as a default
return when by-mail avatar lookups fail too (both gravatar
and libravatar support passing a default)

2016-06-27 18:12:30 +08:00

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