- add & use CommonParams.ROWS_DEFAULT constant (instead of 10)
- add & use CommonParams.START_DEFAULT (instead of 0)
- add CommonParamsTest test (initially only with test(Start|Rows)[Default] methods)
This will make it easier to understand what value is used if the "rows" parameter is omitted, and in the case of the "start" parameter it makes the 0-or-1 question go away.
The newly added CommonParamsTest methods are to ensure accidental (or intentional) changes to the (default) constants are caught by a test.