Added new effects

Functions to calculate new effects moments_effects and corr_diff added.

2.1.2

Release to Zenodo

Version 2.1.1

Updated documentation

Version 2.1

Updates include:

• Drop to data function in mod_results, bubble_plot, orchard_plot and caterpillars
• Document clean up.
• Fix to i2_ml big
• Update to vignette

Version 2.0 Release

Disgnosed small bug