If true, then display of user pictures or filenames will use the
method of providing arguments as "slash" arguments - this is much
better for caching, proxies, search engines etc. Unfortunately
it doesn't seem to work on some PHP installations.
If false (the default), then a more compatible method is used
(ie usual way of passing parameters to scripts)
gmdate to format times, thus allowing it to take advantage of locale, if set,
to print dates in the appropriate language. Several userdate invocations
had to be changed, though, to use the different formatting specs.
