ENH: refactor paraview readers code to avoid duplication
- as originally intended years ago, but never actually done. - use 'foamPvCore' instead of 'vtkPVReaders' to avoid potential name collisions with any 'vtk*' files and since we may reuse these functions in other foam-paraview modules (not just readers). STYLE: use same font size/colour for patch-names as for point-numbers BUG: repair issue with single time-step - paraview time-selector returns '0' as the requested time if there is only one time step. However, if we have skipped the 0/ directory, this single time step is likely a non-zero value.
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