Properly account for pre and post rownorm in Pixie file names (#13)

- Ensure names reflect proper row normalization states (a8ad47d0e9b67262852f6705e826bc34483efb9c)
- Update cell clustering params to include tiff_dir and img_output_dir (4e776625d85897cfec5f977e826dd913b3184c3a)
- Ensure weighted cell channel data actually contains label (660b9d3262db1fdabd10ff22c1d49c0af6009f5f)
- More updates from segmentation_label to label (c38309e19d7eaae9f67e1cf8e08a3fd2b8a6f299)

data/pixie/example_cell_output_dir.zip

@@ -1,3 +1,3 @@
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-oid sha256:e8892f915d629d6231c419469c1c119ddf0a552c6affe6ce9a9683eec8d6f523
-size 2873904
+oid sha256:a76c024385ae04c9f21229a053c3623429d9fa26241265fc304e92716eb5fe3d
+size 2888930

data/pixie/example_pixel_output_dir.zip

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:2b7b8675423ecbfaefbcd7e63a89dd684990202ad408e26052131edabb3ea1ca
-size 1384926621
+oid sha256:1e01263920bb7d98b836204ad3c7e6175487c9d139c7cf504c136391536796ba
+size 1384928027