storage: make name primary key in Files table

Signed-off-by: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>
search_storage: fix encoded hex string to int conversion in crc32

Signed-off-by: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>
storage: update_duplicates removal addon

Signed-off-by: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>
storage: primary key: check if file already added to db

Signed-off-by: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>
search_storage: use python crc32

parsing the crc32 perl script for each file was a bottleneck

Signed-off-by: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>