* synch with rel_2_2. Probably the last non manual synch, as rel_2_2 should not be modified deeply.
* code cleaning (cleaning warnings from perl -w) continued
A new function allows for printing of call number rather than title/author
(default behavior). These barcodes should work fine now with any scanner
capable of Code 128 (with a checksum).
- possibility to print continuous barcodes numbers, but not from items
- possibility to replace the title/author by a manually typed text under the barcode itself.