removed JoinColumn annotations which were causing additional LEND_USER table creation
changed merge to persist
removed some fancy fuzzy text searching features, maybe will be reimplemented some day
finally added exchanging book between users and added returning books
cleaned code from not necessary LOGgings
none of controllers can use EntitiyManager obtained from @PersistenceContext; following strictly instruction
removed useless TLib_Client_SE
now books are fetched at the EAC's startup