[cli] Added parameter -m for specifying a mesh input directory.
Per default meshes are loaded relative to the .prj-file directory.
ogs -m ../some/path the meshes are loaded relative to the specified
directory. This is useful in workflows where you generate different sets of meshes (e.g. different number of partitions) for the same .prj-file.
Works both for serial as well as partitioned meshes.
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