Make IO operations with nbackup backup file aligned at page size boundary
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                 Key: CORE-4939
                 URL: http://tracker.firebirdsql.org/browse/CORE-4939
             Project: Firebird Core
          Issue Type: Improvement
          Components: NBACKUP
            Reporter: Vlad Khorsun


Currently nbackup backup file contains backup header followed by set of 
<page_number, page_contents> pairs.
Since ODS 12 we store page number at page header. Therefore there is no need to 
store page_number before 
page contents in backup file. Such change makes IO aligned at page size 
boundary which should be more efficient
and opens possibility to work with async\unbuffered IO in the future.

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