prepare-batch is defined already in the misc ns
transfer measurements in batches
make the measurements transfer resilient to stops

by recording the sensors that have been migrated already.
better handling of the list of processed sensors
unlogged batches
paginate batches
paginate batches for measurements posts
Merge pull request #48 from MastodonC/feature/paginate_measurements_post

paginate batches for measurements posts
Fixed title position & text and axis text position
Merge pull request #49 from MastodonC/feature/chart-chrome-tweaks

Fixed title position & text and axis text position & n/a filtering
Explicitly check dirty dates.
Add functions to add, subtract and divide datasets.
Tidy up operations.
wip: CoP calculation.
Add more test data.