Add script to remove and rename a user.
Add support scripts for renaming/removing users.
Improve renuser.sh (take into account rating).
Activate parallel build by default.
Fix admin data displayed in the themes page.
Merge branch 'po/fix-themes-admin'

* po/fix-themes-admin:
  Fix admin data displayed in the themes page.
Minor reformatting.
Properly encode / as it is a separator in the URL encoding.

This patch fixes a bug when the name of a post contains a slash.
Add entry for 3.5.2