LP#
1521693 Sqitch instances for base schema and concerto data
* Creates a new sqitch instance under Open-ILS/src/sql/schema/ for
deploying the base Evergreen schema.
* Creates a new sqitch instance under Open-ILS/src/sql/test-data for
deploying the sample (concerto) data set.
No verify or revert scripts are implemented in these changes, since the
goal is only to port existing EG SQL changes into the new structure.
All SQL changes up through 0920 are represented in the initial base
schema files. Starting with 0921 (schema.conditional_negative_balance),
each upgrade is represented as a self-contained Sqitch install target.
Signed-off-by: Bill Erickson <berickxx@gmail.com>