Some classes renamed & todo's done
Wrapped IOException into RuntimeException
Moved FileMap
FileMap implements AutoClosable
Added additional exception handling
Now read-only databases allowed
Merge branch 'task4' into task5
Merge branch 'task4' into task5
Added implementation stub
Merge branch 'task4' into task5
Merge branch 'task4' into task5
Added task5 test stub
Created package table & created stubs for signature & row
Added ClassUtility
Merge branch 'task4' into task5
Implemented TableRow & TableSignature
Changed primitive types for classes
Added null column class handling
Changed Class for Class<?>
Added code for reading signature.tsv & StructuredTable finally implemented