edited insertBorrowingTuple to take in the respective callNumber and the respective copyNo from the BookCopy table
Merge pull request #12 from g2-aj/branch_alshahna

edited insertBorrowingTuple to take in the respective callNumber and the...
Merge pull request #11 from g2-aj/g3-ks

Added checkout transaction to CLerk
updated the status in BookCopy for the borrwed book
edited inertBorrowing to take in bid
processing a return in progress, still need to process fine and hold request within this transaction
Merge pull request #13 from g2-aj/branch_alshahna

process return transaction ... in progress
completed process return transaction in clerk.java -- still needs to be tested
Merge pull request #14 from g2-aj/branch_alshahna

completed process return transaction in clerk.java -- still needs to be ...
added DateHelper class to calculate Date class, and updated the processReturn function to use this
Merge pull request #15 from g2-aj/branch_alshahna

added DateHelper class to calculate Date class, and updated the processR...
Added not null constraints to tables in lib_tables