#7 Row add doesn't respect DB's "default" value for a field

[Jaakko Vallo]

This happens atleast with MsSQL/ODBC. axTools correctly
tells that a value for a field is required but if a
default value is specified in the schema it is not used
and row insert fails.

axTools should be made aware of the possible default
value and if a required field is missing, it should
tell the DB to use the default instead.