[bug-gnutrition] Fixes for: first run bug + subdirectory in gnutrition configuration dir

[Adam 'foo-script' Rakowski]

Gnutrition homedir is in.gnutrition/version_number.

Fixing a problem with empty db and empty config when first-run druid has
been canceled.

If druid was canceled on first screen, then empty sqlite file was
created and next time gnutrition tried to load data from this file.
Similiar, the empty configuration file wasn't deleted when user cancels
config-druid.

-- 
Pozdrawiam
AR
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