Gadu-Gadu protocol
- protect avatar seted in AVS with "protect the picture" option
(AVS could delete protected avatar if gg contact has no avatar and gg service PS_GETAVATARINFOT returned first GAIR_WAITFOR and then GAIR_NOAVATAR)
- improve avatar related netlog logs, add some comments

git-svn-id: http://svn.miranda-ng.org/main/trunk@3003 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c