Merge branch 'dev' into master

file_java/src/App.java

file_java/src/Controller/DL_author.java

file_java/src/Controller/DL_availible.java

file_java/src/Controller/DL_book.java

file_java/src/Controller/DL_borrow.java

file_java/src/Controller/DL_gborrow.java

file_java/src/Controller/DL_user.java

file_java/src/Controller/DP_author.java

file_java/src/Controller/DP_author_add.java

file_java/src/Controller/DP_book.java

file_java/src/Controller/DP_book_availible.java

file_java/src/Controller/DP_borrow.java

file_java/src/Controller/DP_gborrow.java

file_java/src/Controller/DP_user.java

file_java/src/Controller/Insert_author.java

file_java/src/Controller/Insert_borrow.java

file_java/src/Controller/Update_borrow.java

file_java/src/Data/Author.java

file_java/src/Data/Book.java

file_java/src/Data/Borrow.java