Properly indent StaticRequestHandler
Improve handling of non-existing static files

Instead of SEGFAULT, we rather just send a nice error messaage.

Further, this abstracts out a few more parts into AbstractConnection,
so that a dynamic_cast isn't necessary any longer.
Merge pull request #107 from bastih/feature/improve_static_handler

Improve static handler to not segfault on non-existing files + some general improvements
Move taskscheduler tests into own binary
Merge pull request #108 from lordgeorg/taskscheduler-units

extract Taskscheduler units into separate binary
Remove Unused Multitable Expressions
Merge pull request #110 from bastih/feature/remove_multitable_expressions

Remove Unused Multitable Expressions
Fix warning in unit_access
Add debugStructure() for debugging involved structures
Merge pull request #112 from bastih/feature/debug_structure

Add debugStructure() for debugging involved structures
Add OperationData::all()
Make checked cast work as expected for production use, too
UnionAll extended with MTV optimization
Merge pull request #114 from bastih/feature/mtv_op

Add UnionAll optimization for MutableVerticalTable-nested PointerCalculators
Simple invoice join working.
Merge remote-tracking branch 'upstream/master' into feature/CustomColumnTypes