Committed changes to Pier-Math and Pier-TagCloud

In Pier-Math it's just fixes mainly because it hardcoded the paths to latex and dvipng. I added a new subclass of PRTagCloudWidget with a different formula for scaling the tags: - it computes mean and standard deviation in occurences among the displayed tags, - tags in the mean get 100% size - the scaling tends towards a factor of +/- two for outliers - tags at standard deviation are visibly scaled (I don't remember exactly but twice the std dev would give 80-90% of maximum scaling) No commit comment because the Accept button threw itself under a click :) -- Damien Pollet type less, do more [ | ] http://typo.cdlm.fasmz.org