Iglu-py

* CRAN release to match upcoming paper summarizing updated MAGE algorithm, episode calculation functionality, meal metrics, clustering and new example data inclusion

* minor bugfix in MAGE: stopped extraneous warning from being thrown
* Added tests for mage + mean + median + sd

* MAGE plot can now show excursions via "show_excursions = TRUE" flag
* debugged formatting error with Mage vignette
* debugged internal build warnings
* Metrics heatmap removes metrics with no variability across subjects
* Add example dataset to demonstrate meal metrics calculations

* MAGE handles traces with gaps, restarting calculation when gap >= user-defined threshold
* MAGE returns ggplot as well as plotly
* Fixed plotting functionality with large gaps and multiple segments
* MAGE "left-side accumulation" optimization
* Added "MAGE_max" and "MAGE_avg" to possible directions able to be calculated (in addition to MAGE+, MAGE-, and Service's definition)
* Updated MAGE vignette for more details

* minor bug corrections in mage calculations
* adjustment from summarize to reframe
* update algorithm for episode calculations
* DT package import for shiny app
* add glycemia risk index (GRI)
* add AGP plot smoothing
* add functionality to create a heatmap of metrics by subject

* bug correction for denominator in hypo_index and hyper_index in case of missing glucose values