#1 import/export parts of database

[Natanael Copa]

Use the output of sfic as input for another sfic process.

The purpose is to be able to copy a few records from
one database to another, without need to regenerate and
re-create the checksums from files on filesystem.

For example. move all non-directories from all.tdb to a
new database non-dirs.tdb:

sfic --list new.tdb | grep -v ^d | sfic --import
non-dirs.tdb

Something like that.