Changed Split method and fixed Concatenate method.
Fixed the Alexnet example.

Removed old tests.

Updated some old architectures and added variable assignments of IO-Variables and global Variables. Optimized resolve mechanism.

Started implementation of ArchValueSymbol and VariableSymbol.

Added method definitions.
Added math expressions.
Added serial and parallel argument sequences.

Added keywords 'def', 'group' 'output' and 'repeat'.
Added more tests and architectures of existing networks.