Sha1() function protect

Update the index.php, inser.php, select.php, update_applicant.php. Don't
use exist_applicant.php
Merging Solomon's updates for sha512

Merge branch 'Solo_sha1_passwordProtect' of https://github.com/AmundsenJunior/a100-app
Overwrote repo with ThaddeusANg/a100-app repo