- Bumped minimum R required version to 3.5 (sysdata.rda uses workspace format version 3)
- Replaced
`testthat`

with`tinytest`

for Unit Testing. - sgo_coordinates gained a couple of paramaters meant for geodetic coordinates.
- Improved the speed of NGR conversions.
- A little tidy-up of both code and documentation.

**Fixed**: Now, when converting from 2D BNG to 3D BNG, the input is first converted

to 3D by filling z with zeros. Previous versions just added zeros to the output.**Fixed**: When converting from 2D to 3D coordinates with the same datum the z

column was not being filled with zeroes.**Fixed**: Points right on the upper boundaries of the OSTN grid are considered

outside of the OSTN15 rectangle.**Fixed**: Output text of the print function.- Improved slightly the speed of 3D calculations from/to BNG.
- Improved some parts of sgo_transformsâ€™s documentation.

- Initial release on CRAN.