Implemented the login system.  Removed page links from header, because the system will now not allow going to a different screen than you are logged in as.  Added user information to the $_SESSION array when user is logged it.  This info can be used on the different pages.
Fixed a bug in authorize.php with failed to authorize Table accounts due to a naming convention issue in the database.  A workaround is in place.
Delete dataSources.xml
Delete workspace.xml
Merge pull request #15 from mdt0093/login