farmPartial 0.1.0

• Initial release.
• Four-quadrant farm partial-budget calculations.
• Baseline-versus-alternative budget comparison.
• Break-even, one-way and two-way sensitivity, and scenario analysis.
• Monte Carlo uncertainty analysis with normal, lognormal, uniform, triangular, and fixed component distributions.
• Trial budgets, dominance analysis, and marginal rate-of-return analysis.
• Equivalent annual cost calculation for capital changes.
• Illustrative per-hectare wheat-management example.