- solver ALMM not supported for complex scalar type

- based on Basic example
- check output of example in tests

- topological dimension no longer required
- add const

- permits mixed numbers of vertices
- guess quadrilateral/tetrahedron based on coordinate dimension

- additional scope is no longer needed

- useful for testing output with larger datasets

- cpppetsc's HDF5 output does not support multiple types of elements

- fix dimensions in Timoshenko beam example

- generates a mesh of Hexa8 elements
- granularity can be controlled via a command line parameter

- avoids potential future name collisions

- reduces compile time for users