DicomFileRunner should process files in parallel

[rkm]

Should be a straightforward change, but probably requires the report classes to handle concurrent writes if they don't already.

IsIdentifiable/IsIdentifiable/Runners/DicomFileRunner.cs

Lines 134 to 173 in f03bc23

	public override int Run()
	{
	_logger.Info($"Recursing from Directory: {_opts.Directory}");
	if (!FileSystem.Directory.Exists(_opts.Directory))
	{
	_logger.Info($"Cannot Find directory: {_opts.Directory}");
	throw new ArgumentException($"Cannot Find directory: {_opts.Directory}");
	}
	ProcessDirectory(_opts.Directory);
	CloseReports();
	return errors;
	}
	private void ProcessDirectory(string root)
	{
	//deal with files first
	foreach (var file in FileSystem.Directory.GetFiles(root, _opts.Pattern))
	{
	try
	{
	ValidateDicomFile(FileSystem.FileInfo.New(file));
	}
	catch (Exception ex)
	{
	if (ThrowOnError)
	{
	throw;
	}
	else
	{
	_logger.Error(ex, $"Failed to validate {file}");
	errors++;
	}
	}
	}