def getTemplates(fnames, blend=True):
    """ Process all headers to produce a set of combined headers
        that follows the rules defined by each instrument.

    """
    if not blend:
        newhdrs =  blendheaders.getSingleTemplate(fnames[0])
        newtab = None
    else:
        # apply rules to create final version of headers, plus table
        newhdrs, newtab = blendheaders.get_blended_headers(inputs=fnames)

    cleanTemplates(newhdrs[1],newhdrs[2],newhdrs[3])

    return newhdrs, newtab
Process all headers to produce a set of combined headers
        that follows the rules defined by each instrument.