page_parser emits filenames that can't be sorted correctly

For non-FIL_PAGE_TYPE_BLOB pages, page_parser emits filenames in the format internalID-pageID.page. It zero pads the page ID to 8 places, but does not pad the internal ID.

The page concatenation step in the documentation (http://www.percona.com/docs/wiki/innodb-data-recovery-tool:mysql-data-recovery:extracting_the_data) recommends using the following command:

find pages-1246363747/0-286/ -type f -name '*.page' | sort -n \
   | xargs cat > pages-1246363747/0-286/customer_pages_concatenated

However, because the prefixed ID is not padded, the sort command used can result in an output file containing out or order pages.