add support to .las files

[x-malet]

Could help to deal with borehole logging or LiDar files.

LAS Standard

[x-malet]

A good start could be to use : http://lasio.readthedocs.io/en/latest/

[x-malet]

another good element is to use :

• https://github.com/agile-geoscience/striplog for stratigraphy
• https://github.com/agile-geoscience/welly for well informations