update interval no longer shrinks with recursion

See merge request !186

Previously, the endtime-starttime interval being processed by the
`run_as_update` method would shrink by 1 (second) with each recursion.
This ultimately broke `run_as_update` when processing anything other
than 1-second data, but it wasn't obvious because we rarely had to
actually recurse. There is a little trickery now to ensure that user-
provided starttime and endtime are inclusive of the full first
(most recent) update interval, while subsequent, calculated, endtimes
are set equal to the prior starttime minus specified output_interval
(e.g., 'second', 'minute', etc.).

Parse data type in imfv122 files

See merge request !184

Attempt StringIO after failed BytesIO file read

See merge request !183

Gitlab 15 requires slightly different configuration to generate
Cobertura coverage reports. See:

https://docs.gitlab.com/ee/ci/yaml/artifacts_reports.html#artifactsreportscoverage_report

Trying to dislodge a plugged pipeline in Gitlab

It turns out that none of the factories currently being used in
production expects bytes as input, and in fact, Util.read_url()
converts everthing to a string anyway, so a BYTES-oriented input
would couldn't not possibly be working. So, just remove all use
of BYTESIO, and instead use only STRINGIO.

It worked when a URL template was used, but not if a
single simple filename was passed

This is a bandaid to allow the `--input-url` option to be used to
read in single files. It adds zero functionality beyond what already
existed when the `--input-file` option was used.

Back to build runner

See merge request !181

Login cache control

See merge request !180

Pipeline updates

See merge request !178