Evaluate: HSQLDB and H2

[muuki88]

Maybe we can replace Derby with a newer version (10.8.x)
or with a completely different Java database like

• Apache HSQL
• H2 Database

Both have (DBAccess Implementations)[https://github.com/muuki88/gemini.dbaccess]

[muuki88]

HSQLDB is a lot faster on startup and creating the db.