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Import Neighbor List filter needs to be written #1678

Description

@imikejackson

There is currently no way to import a neighborlist, not even from an existing HDF5 file.

This feature request proposes to create an "Read Neighbor List" filter that reads a neighborlist from a text file. The format of the text file is:

# Lines that start with a '#' are comments
[N], [value-0, value-1, ..... value-(N-1)]

The Input parameters would be:
FileSystemParameter with "Input File" using normal text file extensions such as .txt, .csv, .dat
Numeric Type parameter so the user can select the proper type for the NeighborList

The output parameters are:

DataArrayCreation parameter. The parent can be anything.

The filter should have some sort of file caching in place so that preflight does not bog down reading the file over and over. There are other filters that implement this scheme.

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