LinHES-system: system restore/backup modifications.

- restore:  Added support for partial restores.
usuage:
    lh_system_restore $restore_file_name  partial
if partial is not in the cmd line, then a full restore will take place.

Partial restore of a backup file:
*stop mythbackend
*save a copy of the current settings for the host. This only includes the settings table and storage group definitions.
* save teh entire DB (just in case)

*restore the full database from the backup file
*restore the copy of the settings, taken from step 1. (This is needed to keep the current configured states consistent)
*start mythbackend

- backup,  print the name of the resulting file

refs #893

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