New tcpdf barcode label printing class and add parameters to printsheet
for using this class.
Add parameter to modules_xxx.php functions to pass printing templete
class to use

Extend member and printsheet sticker printer classes from new abstract
commonsticker generator

Common abstract class for sticker printing.
Creates contracts for write_file and addSticker methods

Add modTcpdfbarcode class
Add pdf_label class
pdf_standardlabel extends pdf_label

Conflicts:
	ChangeLog

Conflicts:
	htdocs/main.inc.php

instances
-Update changelog for 3.7.1

Conflicts:
	ChangeLog
	htdocs/install/mysql/migration/3.6.0-3.7.0.sql

instances
-Update changelog for 3.7.1

Fix: Bug in the new photo system

creation/update.

Conflicts:
	htdocs/comm/action/class/actioncomm.class.php
	htdocs/core/class/commonobject.class.php