Geostats (kb2d e gamv_3D)

[bro-geo]

Good afternoon,

First of all, I want to congratulate the team for their work. I am developing a research that consists in the elaboration of a three-dimensional geotechnical database and I was excited to find this library. I'm trying to put it with a graphical interface in QGIS which will allow it to be used more easily. While using the library I noticed some issues.

1. The kb2d function uses the real function on lines 2394, 2449, 2489. This function is not recognized and causes an error during execution.
2. Using the kb2d function, I always get the numpy.ndarray error.
3. The gamv_3D function is called the variogram_loop_3D function that does not exist in the library.

My sugestion is create class objects for 2d and 3d functions.

Thank you again for this work.