jpmesh 2.0.0

• To introduced a new meshcode class. This is one of the classes of S3. The mesh code values returned by the package are implemented in the meshcode class. Also, meshcode() creates an object of meshcode class of arbitrary size #49.
  • is_meshcode(), as_meshcode()
• Update administration mesh code data using at administration_mesh()
• Activate a memoise some functions for efficiency #50.
• Support 100m mesh code as subdiv_meshcode class #51.