Add a number of missing spring modules to dependencyManagement
Reorganize migrations

Each supported database now has it's own folder with copies of the
existing create sequence/table scripts. No longer try to stuff the
tables into a new schema. The db/migration folder is empty for now, but
eventually will be used for scripts that are database agnostic (like
data insertion scripts).
Remove unnecessary references to spring.framework.version property
Mark InitializeSchedulingAssistantDatabase as deprecated.
Remove problematic hsqldb.tx=mvcc

Caused flywaydb to hang after running a migration script.
Create @Configuration for running flyway migrations

Also created database specific @Configurations, replaces need to define
the incrementers in applicationContext.xml (or
localOverridesContext.xml).
Additional detail on startup regarding Quickstart directory