Fix row count parsing for large 32-bit SAS files#96
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This patch fixes parsing of SAS row counters in 32-bit sas7bdat files by interpreting rowCount and mixPageRowCount as unsigned 32-bit integers.
Previously, these values were read using signed int conversion, which could produce incorrect negative or overflowed row counts for large files. The change adds unsigned 32-bit conversion while preserving existing 64-bit behavior.