elizagrames/litsearchr: v0.4.0

The main change in this version is that all core text processing functions have been moved back from synthesisr into litsearchr so that metaverse packages are more modular, which changes the package structure but not functionality. litsearchr now only calls synthesisr for file import and deduplication.

I have also made minor changes to check_recall to fix an error and hidden functions only called internally.