sgf-viewer: Make move comments show up correctly for white

[tomtseng]

prepare_data.py processes the comments in SGFs to make the adversary/victim predictions more human-readable. The games in the "Positions analyzed with varying visits" encounter a few issues with this comment processing:

• All the games had comments for white in the form C[...]W[...] instead of W[...]C[...]. prepare_data.py did not process such comments.
  • Fix: I copied the position analysis SGFs and ran sed -i "s/ *\(C\[[^]\]*\]\) *\(W\[[a-z]\{,2\}]\) */\2\1/g" *.sgf on them to replace C[...]W[...] with W[...]C[...].
  • (Not sure why this happened. I haven't seen any other SGFs have that form of comment formatting.)
• Two games had comments like B[...] C[...] (with a space in between) instead of B[...] C[...]. prepare_data.py did not process these comments.
  • Fix: Change prepare_data.py to accept spaces between B[...] and C[...]

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[kellinpelrine]

Good catch. I remember having to do something to get those games formatted on one line too, originals look like below, which outright crashes prepare_data.

I think Nora prepared the files with these games for me back when I didn't have NAS access. So might be from different source/process than most. If we encounter this more we might want to adjust prepare_data so it processes them directly, but hopefully only one-time thing so the copy and sed solution seems reasonable. And sounds good on the "robustness to space" bit.