backup / restore speedup: add switch to process only METAdata of table(s) and 
skip it's DATA
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                 Key: CORE-4343
                 URL: http://tracker.firebirdsql.org/browse/CORE-4343
             Project: Firebird Core
          Issue Type: Improvement
            Reporter: Pavel Zotov


It will be useful to bypass handling DATA of some huge tables that are NOT 
parent to some other ones (e.g. have no link from some FKs).
For instance, in our production one of the tables consumes more than 60% of 
time to be restored (this is AUDIT table: it will never be *parent* for any 
kind of other tables).

I propose to add the switch like '-s table1[, -s table2[, -s .....]' that can 
occur many times in command that runs gbak and this switch will force engine to 
b/r only METADATA of corresponding table(s).
If any of such tables is PARENT for some other one(s), operation should be 
abandon.


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