Moved prints to bottom of public_functions

publicPrint functions do not respect the output($arguments, "...") way
of API calls, so they should be separated.
Removed $noverbose from public_functions

Usage of the optional $noverbose=false argument is completely gone.
Initial testing hasn't found any bugs related to it missing.
Moved publicAddBook into publicBookImportISBN

Nothing else was calling publicAddBook, which was basically a redundant
duplicate, so its functionality was moved into publicBookImportISBN.