Fix and Enhance Prophet and Gluonts forecasters

See merge request !315

Merge branch 'morphemic-rc2.0' of https://gitlab.ow2.org/melodic/morphemic-preprocessor into morphemic-rc2.0

Iccs eshybrid 2.0

See merge request !314

tft + nbeats with poetry

See merge request !308

Iccs eshybrid 2.0

See merge request !306

Update prophet_listener.py

See merge request !301

temp fix

See merge request !300

Explicitly specify targeted Ubuntu version

See merge request !293

Miscellaneous corrections and improvements

See merge request !292

Correction to spawn correctly the R forecasting subprocess from Python in Linux (and not only in Windows)
Improvement of the command used to start the forecasting process, in order to flush python output and obtain logs immediately when published
Logging and business logic improvement in forecasts to warn about the availability of data with a timestamp equal to or newer compared to the timestamp of the requested prediction time, and nevertheless return the last available timestamp in the dataset

Iccs eshybrid 2.0

See merge request !291

Improvements to allow exponential smoothing forecasts using smaller forecasting horizons

See merge request !286

Added appropriate code to handle cases in which predictions should be made with a horizon of less than 300 seconds in the future (setting the aggregation interval equal to this horizon)
Added option in subprocess spawning to improve logging output
Improvement of the handling of an unusual configuration and dataset combination (asking to use realtime mode on stale dataset)

Update gluonts_listener.py

See merge request !282

Corrections necessary for the appropriate operation of the exponential smoothing predictor

See merge request !280

More logs, and initialization sequence

See merge request !281

Correction of the handling of an exception when prediction cannot be made

Exponential Smoothing forecaster improvements

See merge request !278

Implemented some data sanitization to cover the case in which erroneous data is included in the dataset (and therefore remove timestamps which are outside the time range for which data has been requested for)

Addition of helper print_with_time method, allowing better log output (including the time), and change of print() calls to use it