These files implement a database-backed website designed for accepting and storing
DNA sample metadata. In other words, it stores no actual DNA sequence, only information
on collection location, pedigree, species, contributing scientist, etc.

A typical usage is as follows:
An investigator who wants to store & share data applies for an account by clicking
a link on the page index.php.  This sends a confirmation e-mail to the
administrators, who are defined in the file constants.php.  An administrator
approves the application, which sends a confirmation e-mail back to the applicant.

The applicant uses their user name and password to log
in to the restricted area of the web site, and goes to the page upload.php to upload
sample information.  They enter their data into a spreadsheet with the help of
the guide on this page and upload it, possibly going through several revisions
to add missing data or fix overlooked mistakes.  When the spreadsheet has been
accepted, administrators are sent a confirmation e-mail.

Administrators review each new submission and accept or reject it based on the
quality of DNA observed in the gel image, and possibly on the information provided
in the spreadsheet.  Submitters are notified in either case, so they can resubmit
their samples if necessary.