job opening updates

*Note: Please make sure to update your database(s) with the latest
AES_SQL_Query_Iter3-v1.sql file*
- Database Change: Job_ID in Applied table is now: JobOpening_ID for
clarity
- Related Job_ID -> JobOpening_ID changes updated in DAO, Services, and
Tests
- Applicant can now "View Job Openings" from welcome screen
- Applicant can choose individual job for application (before getting
into application fill-out "mode")
- Chosen job opening number is then automatically filled in on
application (for the benefit of Applicant)