pr2-primers version 2.1.0

• Uses PR2 database version 5.1.1 released in Spring 2025

pr2-primers version 2.0.0

• Use PR2 database version 5.0.0 with 9 levels instead of 8
• Add 24 primers and 9 primer sets
• Faster file loading using the qs R library
• Allow matches to prokaryotes and plastid sequences