get rid of getenv-calls

There's no point in explicitly loading these, when they can be
looked up in $_SERVER instead.
lookup server-variables in $_SERVER

This reduces some dependencies on register_globals
submit-logo.php: look up file-uploads in $_FILES

This reduces some dependencies on register_globals
submit-logo.php: cleanup indentation
rulez/update.php: load option-flags into global namespace

This reduces some dependencies on register_globals

It also documents a previously undocumented switch, namely
'bbstopics'.
get rid of some old-style code-blocks
Merge pull request #64 from kusma/for-lra2

More cleanups v2