Add Libgmsh support/ flboundadapt#168

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jrper wants to merge 9 commits intomainfrom

Commits on Oct 2, 2017

Read/write .msh files with libgmsh.
jrper
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Commits on Oct 4, 2017

Missing file.
jrper
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Commits on Oct 9, 2017

Commits on Oct 12, 2017

Add flboundadapt tool to generate GMSH from a mesh metric set up in a .flml file.
jrper
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Commits on Oct 16, 2017

Fixes for some of @stephankramer's and @drhodrid's notes, also including better support for standard libgmsh-dev on 16.04.
jrper
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Commits on Oct 18, 2017

Plus bugfix. Squash me.
jrper
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Commits on Oct 25, 2017

Run flboundadapt from a vtu with a metric in.
jrper
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