Bug 6008 - Locating mysql/psql commands on Installer.pm

Bug 6008 - Locating mysql/psql commands on Installer.pm

In Installer.pm when is looking for the system command to dump a file into the database
it might fail if the web user doesn't have it in its path. So we add before a search with
"which" and "whereis" commands, if they fail the command is itself without path.

E.g.: with OpenBSD 4.8 the web user "www" doesn't have the path to the installed mysql bin:
/usr/local/bin/mysql and fails in the web installer.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Seems to work fine, has a good default for if it fails to find that
path

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
tested on my linux box, no visible change, worked before, work after. Will hopefully improve behaviour for OpenBSD