Slight update to fslview package namespace - some sub-packages for

fsl/fslview/controls/__init__.py

fsl/fslview/controls/imagedisplaypanel.py

fsl/fslview/controls/imagelistpanel.py

fsl/fslview/controls/locationpanel.py

fsl/fslview/gl/__init__.py

fsl/fslview/gl/fragment_shader.glsl

fsl/fslview/gl/glimagedata.py

fsl/fslview/gl/lightboxcanvas.py

fsl/fslview/gl/slicecanvas.py

fsl/fslview/gl/vertex_shader.glsl

fsl/fslview/views/__init__.py

fsl/fslview/views/lightboxpanel.py

fsl/fslview/views/orthopanel.py

fsl/tools/bet.py

fsl/tools/fslview.py