Remove TissueTypes dependency in read_mesh. No need for it.
After fixing (commit 137a09fce) the .mesh files to include the tissue types as a 5th entry for each tetra, there is no need for requiring the TissueTypes file anymore. Removing it makes it less complicated for the user. Need to also update the wiki as follows:
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Update .mesh format wiki. -
Remove the requirement for TissueTypes.txt