refnx/refnx v0.1.18

0.1.18 SPZ batch reduction remove some roadblocks to JAXification (float casting in Parameter.value setter) volume fraction of solvent can now be used when constructing a Slab from a Scatterer. Fully remove traces from graph when opening new experiments. Store reduction_options when processing spectra. RuntimeError if a log transform creates non-finite numbers. ReflectModels can now use a q_offset to correct for possible angular misalignments. possibly_create_parameter and is_parameter now use BaseParameter for their operation, rather than Parameter. Thus _BinaryOp and _UnaryOp can be given to these operations and work. This enables construction of various objects (SLD/Slab/etc) from constrained parameters, rather than setting a constraint afterwards. MixedSlab is now allowed to be the first/last Component in a Structure