Bug 13669: Catch the errors to have them to the logs

Bug 13669: Catch the errors to have them to the logs

This patch redirect STDERR to a variable to retrieve the errors raised
by the DBMS when loading a sql file, it could be useful to debug errors.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
It's better of course, trying to load a failed fiel
it outputs mysl errors
DBD::mysql::st execute failed: You have an error in your SQL syntax...
No errors

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>