Aquacrop

What's Changed
Removed all references to ahead-of-time compilation that was partially implemented using the 'numba' package because it was non-functional and creating issues with package dependencies. As a result, package version requirements have now been eased for improved compatability.

**Full Changelog**: https://github.com/aquacropos/aquacrop/compare/v3.0.11...v3.0.10

Updated Readme describing model features and background

What's Changed
Thanks to oleksmialyk for the fixes and improvements:
* check_groundwater_table.py now correctly returns NewCond_zGW variable
* Removed incorrectly hardcoded 15mm irrigation for IrrMngt_IrrMethod == 1 in irrigation.py
* root_development.py now correctly returns NewCond_rCor
* User input of bund height is still in metres but this is now converted immediately to mm upon initialisation of fieldManagement for consistency of units in calculations.

**Full Changelog**: https://github.com/aquacropos/aquacrop/compare/v3.0.8...v3.0.9

What's Changed
* Minor update to calculation of GDD growth stages when switching from calendar days.
* New crop parameter 'SwitchGDDType' can be specified as 'mean' (default) or 'median', calculates GDD growth stages from calendar day growth stages, using all simulation years. 'mean' or 'median' refers to how the calculation summarises GDD values for each growth stage across all years.
* New crop specification 'SugarBeetGDD_UK'.

**Full Changelog**: https://github.com/aquacropos/aquacrop/compare/v3.0.7...v3.0.8

Fixed issue with fresh yield calculations.

What's Changed
Minor fix to alleviate dependency issue, change cffi from 1.15.0 to 1.16.0.