Create a hierarchy of proto files in a destination directory, copied
        from the schemasPath hierarchy

def _createSchemaFiles(self, destPath, schemasPath):
        """
        Create a hierarchy of proto files in a destination directory, copied
        from the schemasPath hierarchy
        """
        # Create the target directory hierarchy, if neccessary
        ga4ghPath = os.path.join(destPath, 'ga4gh')
        if not os.path.exists(ga4ghPath):
            os.mkdir(ga4ghPath)
        ga4ghSchemasPath = os.path.join(ga4ghPath, 'schemas')
        if not os.path.exists(ga4ghSchemasPath):
            os.mkdir(ga4ghSchemasPath)
        ga4ghSchemasGa4ghPath = os.path.join(ga4ghSchemasPath, 'ga4gh')
        if not os.path.exists(ga4ghSchemasGa4ghPath):
            os.mkdir(ga4ghSchemasGa4ghPath)
        ga4ghSchemasGooglePath = os.path.join(ga4ghSchemasPath, 'google')
        if not os.path.exists(ga4ghSchemasGooglePath):
            os.mkdir(ga4ghSchemasGooglePath)
        ga4ghSchemasGoogleApiPath = os.path.join(
            ga4ghSchemasGooglePath, 'api')
        if not os.path.exists(ga4ghSchemasGoogleApiPath):
            os.mkdir(ga4ghSchemasGoogleApiPath)

        # rewrite the proto files to the destination
        for root, dirs, files in os.walk(schemasPath):
            for protoFilePath in fnmatch.filter(files, '*.proto'):
                src = os.path.join(root, protoFilePath)
                dst = os.path.join(
                    ga4ghSchemasPath,
                    os.path.relpath(root, schemasPath), protoFilePath)
                self._copySchemaFile(src, dst)