Checkstyle fix
Added some tests
deleteRecursievly moved to FileUtils & added some additional exception throw
Some minor fixes and situation handling
File separators in table names are now prohibited
Some tests added
checkstyle fix: if construction must use {}
junit system property is now set to true
removeTable now removes table from tableInstances map
we need more tests
Some classes renamed & todo's done
Wrapped IOException into RuntimeException
Moved FileMap
FileMap implements AutoClosable
Added additional exception handling
FileMap tests added
Now read-only databases allowed
Merge branch 'task3' into task4
System property warn_unsaved is now set
Checkstyle fix