Improvements
- Added early dependency checks for pwalign in functions that use pairwise alignment. If certain dependency conditions can't be met, the error is raised immediately, preventing unnecessary computation (#26).
- Replaced rjson with jsonlite to maintain compatibility with R < 4.4.0. The recent rjson update (v0.2.22 , 2024-08-20) requires R (>= 4.4.0), which would break builds on r-oldrel (#28).