[repo transaction] fix rollback behaviour as discussed on the mailing-list: instead of rollbacking automatically on Unauthorized/ValidationError, mark the transaction as uncommitable and disallow commiting

[system]

db-driver   = sqlite
db-host     = 
adapter     = native
db-name     = tmpdb
db-encoding = UTF-8
db-user     = admin
db-password = gingkow

[admin]
login = admin
password = gingkow