[#ARCH-152] Build-time db system property not propagated across transitive dependencies; removed db classifier from dcm4chee-arc-entity-ext and dcm4chee-arc-entity
[#ARCH-152] Build-time db system property not propagated across transitive dependencies; created persistence projects to hold dbms-specific metadata.
[#ARCH-152] Build-time db system property not propagated across transitive dependencies; added dcm4chee-arc-ddl project to build the create/drop scripts.
[#ARCH-152] Build-time db system property not propagated across transitive dependencies; created db-specific war projects.
[#ARCH-152] Build-time db system property not propagated across transitive dependencies; created db-specific ear projects.
[ARCH-152] Build-time db system property not propagated across transitive dependencies; added db-mysql, db-oracle, and db-all profiles to dcm4chee-arc-assembly.