Pywws

1/ Fix template loop bug (in Python 2 only) introduced in v18.9.0.

1/ Major changes to ftp uploads. New ftp/sftp/copy services do the
uploading. pywws should make the required changes to weather.ini
automatically, but users should check after running v18.9.0 for the
first time.
2/ New services to post to Mastodon and WeatherCloud.
3/ MQTT service can now use TLS.
4/ Various bug fixes and minor improvements.

1/ Restore Python source text encoding comments needed by some Python 2
versions.
2/ Add example AWS uploader module from Chris Ramsay.

1/ Fix duplicate data bug in live logging.

1/ Fix bug in "fixed block" date parsing.

1/ Substantial rewrite of much of pywws. It is now more "standard" in many
ways, such as names of modules, and is compatible with Python 2.7 and 3.
2/ New "service" uploaders. "underground_rf" and "cwop_ham" have been
merged in to "underground" and "cwop".
3/ "Day end hour" can now vary with daylight savings time.
4/ Improved reliability with "3080" class stations.
5/ Various other bug fixes and minor improvements.