#186 Make all classes involved in rpc IsSerializable.
Merge branch 'master' into IsSerializable
Merge branch 'master' into IsSerializable
#117 Update db-schema pptx: add data types.
Merge branch 'master' into IsSerializable
Merge branch 'master' into db-schema-description
#24 Added exception wrapping constructor to all exceptions.
#24 Use wrapper constructor if possible.
Update error messages in frontend.
#55 GetConfigurationRequirements returns an ArrayList.
Merge pull request #229 from Jens-Hildebrandt/master

added compareTo() for ColumnCombinationBitset
Merge pull request #234 from Jens-Hildebrandt/SubsetGraph

Extended subset graph
Merge branch 'master' into getConfigurationRequirement
Merge branch 'master' into WrapperExceptions
Merge branch 'master' into db-schema-description
Merge branch 'master' into IsSerializable
Merge pull request #236 from HPI-Information-Systems/db-schema-description

Db schema description
Merge pull request #241 from HPI-Information-Systems/getConfigurationRequirement

#55 GetConfigurationRequirements returns an ArrayList.
Merge branch 'master' into IsSerializable
Merge branch 'master' into WrapperExceptions