Adds common options to a variant searches command line parser.

def addVariantSearchOptions(parser):
    """
    Adds common options to a variant searches command line parser.
    """
    addVariantSetIdArgument(parser)
    addReferenceNameArgument(parser)
    addCallSetIdsArgument(parser)
    addStartArgument(parser)
    addEndArgument(parser)
    addPageSizeArgument(parser)