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Since OpenFOAM-v1612, FOAM_INST_DIR and foamInstDir no longer have any
special meanings when sourcing the bashrc or cshrc files.
The outdated use of foamInstDir and FOAM_INST_DIR has been largely removed.
If you have environments that used these values, they may require
Write compression value now takes a boolean value instead of the values compressed or uncompressed
Functionality from many moving mesh solvers promoted to their static mesh equivalents - see v1806 release notes
snappyHexMesh: correction to the layer feature angle controls - see v1806 release notes