Added new method: getRowColumnValue()
Added new method: getRowColumnValue()

Added new method: checkVolumnValue()

Slightly modified checkSameSQLResult and overloaded it to be able to use a database regexp different from the built-in one.
(needed for some of the meta table tests).

Ensembl/ensj-healthcheck,thomasmaurel/ensj-healthcheck,Ensembl/ensj-healthcheck,thomasmaurel/ensj-healthcheck,thomasmaurel/ensj-healthcheck,thomasmaurel/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck