Some improvements over the staggered scheme of TH

Update python handling in CMake

CppCheck fixes

Original CppCheck message is:
"Same expression on both sides of '&&'.. Finding the same expression on both sides of an operator is suspicious and might indicate a cut and paste or logic error. Please examine this code carefully to determine if it is correct."

DON'T COPY & PASTE!

The variable is pnt_vec being moved in ctor of PointVec
and then accessed in the info message.

These are needed for the clang tools.

Preparations to use MPL

Stronger type is necessary to distinguish between Variable::density and PropertyType::density.

Small fixes.

Silences a warning.

https://developer.atlassian.com/blog/2017/06/aliasing-authors-in-git/

$ git summary

 project  : ogs
 repo age : 8 years
 active   : 1859 days
 commits  : 12781
 files    : 4757
 authors  :
  3162	Dmitri Naumov      24.7%
  2755	Thomas Fischer     21.6%
  2498	Lars Bilke         19.5%
  1317	Karsten Rink       10.3%
  1095	Christoph Lehmann  8.6%
  1045	Norihiro Watanabe  8.2%
   711	Wenqing Wang       5.6%
    60	Yonghui Huang      0.5%
    21	Francesco Parisio  0.2%
    19	Renchao Lu         0.1%
    19	Chaofan Chen       0.1%
    17	Jasper Bathmann    0.1%
    16	Xing-Yuan Miao     0.1%
    10	Keita Yoshioka     0.1%
     9	Haibing Shao       0.1%
     7	Marc Walther       0.1%
     6	Tianyuan Zheng     0.0%
     5	OGS Bot            0.0%
     3	Jan Thiedau        0.0%
     2	Norbert Grunwald   0.0%
     2	Carolin Helbig     0.0%
     1	Thomas Nagel       0.0%
     1	Myles English      0.0%

[Jenkins] Update library to fix log redirection on Windows.