Add switch to gbak to restore database with specified transaction number
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                 Key: CORE-6121
                 URL: http://tracker.firebirdsql.org/browse/CORE-6121
             Project: Firebird Core
          Issue Type: New Feature
          Components: GBAK
            Reporter: Karol Bieniaszewski


Please add switch to gbak to restore database with specified transaction number.
E.g. Interbase have this as "-START(ING_TRANS)" the name can be different.
I suppose it is very simple to implement as already during restore Firebird 
start this numbering from 1. Now it should take into account if start it from 1 
or specified value from the parameter.

gbak -c -v -START 123456789

and database after restore looks like

Database header page information:
        Flags                   0
        Checksum                12345
        Write timestamp         Aug 9, 2019 15:17:08
        Page size               4096
        ODS version             16.0
        Oldest transaction      123456790  <- THE SPECIFIED NUMBER +1
        Oldest active           123456791
        Oldest snapshot         123456791
        Next transaction        123456850
        Sequence number         0
        Next attachment ID      0
        Implementation ID       16
        Shadow count            0
        Page buffers            2048
        Next header page        0
        Database dialect        3
        Creation date           Aug 9, 2019 15:17:07
        Backup timestamp        Aug 9, 2019 15:17:08
        Attributes              force write

    Variable header data:
        Sweep interval:         20000
        *END*



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