Fixed authen to work with apache 2.4
Fixed incorrect version number
added config file for apache2.4
Upgraded version comparison code to be a bit more robust.
Merge commit '834bec6f2947f92d42c7f292e4b9dbaaf91a6051' into release/2.9
Made a few changes to make the AddUsers table a little prettier in math4.
Adjust indentation
make show-source executable
Fixed an issue where renaming a course caused the past answers to not be found in the database.
Removed extraneous code.
Fixed bug with achievement items not generating the correct array of set problem counts.
Correct you're/your in instructions
Merge pull request #289 from ziktar/master

Correct you're/your in instructions
Added the option to use a preamble file with achievements.  This file will be run before every achievement.  (For now its main use is excluding certain sets from achievements.)
Merge branch 'develop' of https://github.com/openwebwork/webwork2 into preachiev
Added some default values for variables in default.config.  (They were causing the errors on the Course Config page.)
Added fixes for a couple of other places where remote_addr was used.
Rremove debugging code.
Fixed a bug where a value could be undefined.
Fixed bug where hidden fields were being double encoded.