copulaSFM 0.2.0

Major Improvements

• Added support for two-parameter copula families (Student-t, BB families).
• Extended copSFM() to accept RHO2, LB2, and UB2.
• Updated TE() to handle two-parameter copulas.
• Added nSim and seed arguments for reproducible Monte Carlo simulation.
• Improved numerical stability of likelihood and technical efficiency estimation.
• Expanded documentation to clearly describe supported copula families and parameter bounds.

Minor Changes

• Code refactoring for improved stability.
• Documentation improvements and formatting updates.