add cmake target and config export for parmmg to support find package

[prudhomm]

• closes Add CMake Target and Config Export for ParMmg to Support find_package #136
• closes Add CMake Target and Config Export for ParMmg to Support find_package feelpp/ParMmg#1

This has been tested with spack packaging of ParMmg and Feel++ here

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.45%. Comparing base (cd8a6e3) to head (a9551c5).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
- Coverage   64.46%   64.45%   -0.01%     
==========================================
  Files          47       47              
  Lines       19584    19580       -4     
  Branches     3688     3688              
==========================================
- Hits        12625    12621       -4     
  Misses       5973     5973              
  Partials      986      986              

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[Algiane]

Thanks!

[prj-]

Please keep develop in sync.

[Algiane]

Thanks,
It is done but the gitlab server of Inria is off this morning so all the tests are failing (I will trigger them again this afternoon).

[prj-]

the gitlab server of Inria is off

Color me surprised!

[prudhomm]

One of the reason i use GitHub. Downtime is very rare. I am not even sure i was ever hit by one. Not so true with the gitlab.