Bug 10337: Add a script to populate devs' DBs with sample data

Bug 10337: Add a script to populate devs' DBs with sample data

Executing the installer process and inserting all the sample data take a
lot of clics and time.
The idea of this script is to provide a quick way to insert all the
sample data easily to get a working Koha install asap.

Test plan:
- Set your database config to a non-existent DB
- Execute perl misc/devel/populate_db.pl
You will get an error
- Create an empty DB
- Execute perl misc/devel/populate_db.pl
It will insert all the MARC21 sample data
- Execute perl misc/devel/populate_db.pl
You will get an error because the DB is not empty (systempreferences and
borrowers tables)

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>