Renamed 'ImageOpts' to 'Nifti1Opts' because it makes sense to. Things

fsl/data/strings.py

fsl/fsleyes/controls/locationpanel.py

fsl/fsleyes/controls/melodicclassificationgrid.py

fsl/fsleyes/displaycontext/__init__.py

fsl/fsleyes/displaycontext/display.py

fsl/fsleyes/displaycontext/displaycontext.py

fsl/fsleyes/displaycontext/group.py

fsl/fsleyes/displaycontext/labelopts.py

fsl/fsleyes/displaycontext/maskopts.py

fsl/fsleyes/displaycontext/modelopts.py

fsl/fsleyes/displaycontext/vectoropts.py

fsl/fsleyes/displaycontext/volumeopts.py

fsl/fsleyes/fsleyes_parseargs.py

fsl/fsleyes/gl/gllinevector.py

fsl/fsleyes/gl/globject.py

fsl/fsleyes/gl/glvector.py

fsl/fsleyes/gl/slicecanvas.py

fsl/fsleyes/plotting/powerspectrumseries.py

fsl/fsleyes/plotting/timeseries.py

fsl/fsleyes/profiles/orthoviewprofile.py