Datacite commented code removed.

Datacite now returns citeproc-js anyway, and this code
has been dormant for a long time.
Makefile is now machine specific.
Initial checkin
Initial checkin of kcite-admin.php.

The admin page was previously hidden in kcite.php. As well as being messy
this required pulling out to fix the lack of a nonce field.
Removal of admin page, and updates to all options to cope.
1.6.1 release candidate.