Item12671: revert "make sure rootTmpDir does not contain spaces", ensure this for project name more generally

The project name is used to create temporary directories as well as
output files, and everywhere a space is understood as a separator. This
is the easy way to fix the resulting breakage.

git-svn-id: http://svn.foswiki.org/trunk@17123 0b4bb1d4-4e5a-0410-9cc4-b2b747904278