Support for sales taxes

Improvements/refactorings

• Upgrade to Mustangproject 1.1.1
• Asset export now also exports status attribute
• Refactored customer edit window
• Delegating driver could facilitate access to external databases besides MySQL (e.g., PostgreSQL)

Fixes

• Don’t list 0 VAT values in VAT:list
• Sort order of accounts is now more stable
• Fixed possible truncationexception when importing from bank account

New features

• Sales tax improvements: Renamed Canadian TVQ to Sales tax, added possible sales tax exemption per customer and per transaction
• respect header/footer lines in templates