compiler warning reductions.
Export of Explicit Lists for Paramters and State Variables is not performed as binary data if the list size is greater than 30 and the option is selected, additonally fixed a bug causing an erroneous pointer cast check when the Value Editor dialog was launched
Merge branch 'binary_weights_and_parameters' of github.com:SpineML/SpineCreator into binary_weights_and_parameters

Something slightly odd has happened, following an attempt to rebase
binary_weights_and_parameters against latest master, which now has the
graphviz_update and the better_memory_management code in it.