Added new FAQ category : Userpics

[opiummmm]

Added category and moved relevant FAQs to it - Also added an FAQ on uploadpic errors (BMP related material) as per this thread : http://www.livejournal.com/talkread.bml?itemid=7114042&thread=9043212#t9043212

Check it out for me? : http://www.livejournal.com/admin/faq/readcat.bml?faqcat=userpics