archshift b3cfcf55ea Refactor ScanDirectoryTreeAndCallback to separate errors and retvals ...

ScanDirectoryTreeAndCallback, before this change, coupled error/return
codes and actual return values (number of entries found). This caused
confusion and difficulty interpreting the precise way the function
worked.

Supersedes, and closes #1255.

2015-11-27 13:33:38 -08:00

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