latentcor 1.1.0

• Rename main function from estR to latentcor.
• Add help function get_types to automatically generate types for data matrix.
• Add more documentation on parameters.
• Add more documentation for speed comparison between original method and approximation.

latentcor 1.2.0

• Add user-defined use.nearPD, so that user can decide if latent correlation matrix should be adjusted to be positive definite automatically.
• Remove redundant code for checking positive definiteness.
• Minor correction on types detection to accommodate NA values.