#186 Make all classes involved in rpc IsSerializable.
Merge branch 'master' into IsSerializable
Merge branch 'master' into IsSerializable
[#230] introduced ColumnPermutations
Merge branch 'master' into IsSerializable
#24 Added exception wrapping constructor to all exceptions.
#24 Use wrapper constructor if possible.
Update error messages in frontend.
#90 Add method to get number of skipped differing lines.
Merge branch 'master' into FileIterator
Merge branch 'master' into WrapperExceptions
Merge branch 'master' into IsSerializable
Merge branch 'master' into IsSerializable
Merge branch 'master' into WrapperExceptions
Merge branch 'master' into FileIterator
Merge pull request #235 from HPI-Information-Systems/IsSerializable

Is serializable
Merge branch 'master' into WrapperExceptions
Merge branch 'master' into FileIterator
#232 Add subset symbol between the column combinations to make the sides clear.
#188 Convert empty strings to null values using Collections.unmodifiableList.