Describe the bug

1. When parsing git diff like this

diff --git a/test/Issue.java b/test/Issue.javanew file mode 100644index 00000000..9702606e

UnifiedDiffReader will throw UnifiedDiffParserException: "expected file start line not found"
I have analyze the code and found thatnew file mode 100644 can't not be recognized. But I found regex that can recognized this line in comment of methodUnifiedDiffReader#parse()

// schema = [[/^\s+/, normal], [/^diff\s/, start], [**/^new file mode \d+$/**, new_file],

It seems that you intend not to recognize this, Could you please tell the reason?

2. The java.util.logging.Logger in UnifiedDiffReader is kind of chatty, How should I turn it off.

3. IsUnifiedDiffUtils.parseUnifiedDiff() designed to only parse the first patch?