STYLE: remove uninformative comments in BMPImageIO
STYLE: remove uninformative comments in BMPImageIO

Also remove spaces between class name and ::

InsightSoftwareConsortium/ITK,hjmjohnson/ITK,BRAINSia/ITK,Kitware/ITK,hjmjohnson/ITK,vfonov/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,richardbeare/ITK,richardbeare/ITK,Kitware/ITK,vfonov/ITK,vfonov/ITK,vfonov/ITK,thewtex/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,BRAINSia/ITK,BRAINSia/ITK,BRAINSia/ITK,BRAINSia/ITK,vfonov/ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,vfonov/ITK,thewtex/ITK,hjmjohnson/ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,thewtex/ITK,Kitware/ITK,thewtex/ITK,BRAINSia/ITK,vfonov/ITK,richardbeare/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,thewtex/ITK,Kitware/ITK,richardbeare/ITK,Kitware/ITK,thewtex/ITK,vfonov/ITK