Updated global.conf.dist so that it will work out of the box
on webwork1.8 courses using GDBM.
http://machine/webwork2_files will point to the webwork-modperl/htdocs
http://machine/webwork2_courses should be redirected by apache to
a folder containing links the the html directories of each course.
In other words apache directs .../webwork2_courses to the folder
/ww/htdocs/ which should contain links of the form
gage_course@ -> ../webwork/courses/gage_course/html