Incorrect NumHardLinks counts for hard linked files

[Robert Nichols]

I'm finding the situation with hard linked files a lot better than I expected. 
The only problem I've run across is that when new files are added to an 
existing group of hard linked files, only the newly added files get the correct 
NumHardLinks count in the mirror_metadata file.

https://github.com/rdiff-backup/rdiff-backup/issues/239

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Bob Nichols     "NOSPAM" is really part of my email address.
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