Move the less important measurement points into a sub-layer.

Add a general presentation at the top of the file, finish the things to
do and especially the office space area description, as well as some
fixes.

_2 contained measurements for _2 and _3, it is now split in two files.

Add measurements realised in June 2013 at the CANMET experimental mine.

Aggregation CSV format versions has been introduced in the OwlPS
development tree (post-v1.3.3), and OwlPS is not able to read the old,
non-versionned aggregation format any more. This commits add the version
number 1 to all the old aggregation files (beside the version number,
the format remains the same, so no other changes are required).