Provide ability to select size of TempCacheLimit during restore via command 
line switch
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                 Key: CORE-4328
                 URL: http://tracker.firebirdsql.org/browse/CORE-4328
             Project: Firebird Core
          Issue Type: Improvement
          Components: GBAK
            Reporter: Pavel Zotov


Building indexes when restoring database takes lot of time if TempCacheLimit is 
not properly selected BEFORE beginning of this operation.
The default value of TempCacheLimit  (64M) mean that almost all sorting info 
will be swapped onto TempDirectories folder(s).
And even if TempDirectories is set to /dev/shm ("ram disk") - it is not panacea 
because as soon as total size of TempCacheLimit is exceeded the speed of 
writing immediatelly decreases.

It will be useful to implement command line switch to GBAK utility for setting 
TempCacheLimit to some value - only at the time of restoring.

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