Fix boxmap code in Basic Mapping, Rate Mapping

[angela-li]

Need to make sure breaks are rounded properly

[angela-li]

Goal is to get into classInt here: https://github.com/r-spatial/classInt/blob/935c0883468916bb5e3a04e303a386aa97cec375/R/classInt.R#L164

[angela-li]

Just need to get rid of floor and ceiling fxns