Define subregion filename in Mesh class

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[codecov-commenter]

Codecov Report

Merging #163 (0d77d7e) into master (49eff5b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #163   +/-   ##
=======================================
  Coverage   95.76%   95.77%           
=======================================
  Files          27       27           
  Lines        2433     2436    +3     
=======================================
+ Hits         2330     2333    +3     
  Misses        103      103           

Impacted Files	Coverage Δ
discretisedfield/io/hdf5.py	100.00% <100.00%> (ø)
discretisedfield/io/ovf.py	99.08% <100.00%> (ø)
discretisedfield/io/vtk.py	100.00% <100.00%> (ø)
discretisedfield/mesh.py	99.37% <100.00%> (+<0.01%)	⬆️

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