New function.
Search author's name for book.
Change  the BookData.
Merge branch 'ISBNimprove'
Add many search function.
Search a book with its writer, part of its name.
Search a reader with its name, e-mail, RID.
Fix some bugs.
Merge branch 'Beta'
Merge branch 'master' into Beta
Merge
Merge pull request #1 from Whoami0117/Beta

Merge branch 'master' into Beta
Merge branch 'master' of https://github.com/Whoami0117/LibraryWho into origin

Conflicts:
	LibraryWho/library.cpp
	LibraryWho/library.h
	LibraryWho/main.cpp