Update to ROISliceUtils to work for ND arrays where N > 3
Moved plotserver (non-generic things) and xmlrpc outside of main plugin.
This frees up the powerful maths of AbstractDataset to be used elsewhere
than Dawn or GDA.
Added new plotserver and xmlrpc split packages to increase modularity of
scisoft.
Merge branch 'master' of ssh://dascgitolite@dasc-git.diamond.ac.uk/scisoft/scisoft-core.git