Reload with openmpi not working

[hydromarc]

Due to this change
https://github.com/wenqing/ogs5-trunk/commit/9c6fb5040200ec6f7abe27f67367d6d540043187
reloading a written solution (option $RELOAD 3 1) is not working anymore with mpi.

The change is part of this PR
https://github.com/envinf/ogs5-trunk/pull/134

I do not know, why the change was necessary.

@wenqing, can you please take a look here?

[wenqing]

@WaltherM The changes in ReadSolution and WriteSolution are just coding style changes. Should you or me create a PR for this issue?

[hydromarc]

Well, if these are only style changes, maybe, the problem we talked about was introduced even before this commit...?

[hydromarc]

@wenqing why did you close the issue? Was it solved?

edit: oh, I see, you had #7 . Thanks!