* New Yaml variable: LAST_PROGRESS, set the number of progress items to start with, so two batch files can have consecutive progress reports. Defaults to 0.
* After creating a batch file, the full path to file is printed and the number of progress items.  This number can be passed to the next invocation of instl as LAST_PROGRESS variable.
* curl will print "Progress ... of ...;" at the beginning of each report line, to allow the invoker of the batch file to track progress even in the absent of absolute numbers.
* InstlAdmin.create_info_map_sig renamed for_file.
* repo rev file now have sig, checksum, and url for index.