Added CMake options WITH_HDF5 and WITH_SQLite3

[anderkve]

This PR fixes issue #581 by adding two new options WITH_HDF5 and WITH_SQLite3 to our CMake system. By default both options are set to True, which corresponds to the current behaviour (automatically looking for HDF5 and SQLite3 on the system). If the CMake option is set to False, the HDF5/SQLite3-based printers and readers are ditched from the build configuration.

If a user e.g. builds with WITH_HDF5=False and then tries to run GAMBIT with a YAML file configured to use a HDF5 printer, they get the following error message

ERROR: A problem has occurred in the printer utilities.
Inifile entry 'printer:"hdf5"' does not specify a valid printer! Please choose from one of the following:
  none
  sqlite
  ascii
  cout

[ChrisJChang]

I've checked and it works, after changing the message, it can be merged.

[anderkve]

Thanks for reviewing. Merging it now.