Errors from the server should be clearer

[brian-hughes]

• I would like to see the error code in the err json structure
• I probably don't need duplicate Error and message fields
• We have lower and upper case Error/error that seem different. Is error needed?

{ Error: [Informix][Informix ODBC Driver][Informix]Unique constraint (informix.u100_2) violated.
errors: [],
error: '[node-ifxnjs] SQL_ERROR',
message: '[Informix][Informix ODBC Driver][Informix]Unique constraint (informix.u100_2) violated.',
state: '23000' }

Maybe an error structure like this would be more useful
{
type: SQL, //presume you might want to differentiate between server error and driver error ? else this might not be needed either
code: -1234,
message: '[Informix][Informix ODBC Driver][Informix]Unique constraint (informix.u100_2) violated.',
state: '23000'
}

[csm03780513]

I think by reading the message you will definitely know where the error is coming from, unless you have encountered something that is not clear