Upgrading from version 2.0.9 to 2.2.0
1. backup your datasets. Always a good idea!
2. install SQL-Ledger over top of your old installation
$ cd /usr/local
$ tar zxvf sql-ledger-2.2.0.tar.gz
3. copy Default-pos_invoice.txt to
templates/your_private_directory/pos_invoice.txt
and edit to suit.