Move macro copy_sqlite3_text_to_buf() to db.h, so it can be used in
hlr_db_tool.c.
Add _dbd_decode_binary() from libdbi to avoid depending on the entire libdbi
just for KI BLOB decoding. Add it in a separate file, copying its own license,
the lGPL.
Offer commandline option "import-nitb-db" to read in an old osmo-nitb database
and copy subscriber IMSIs and 2G auth data to OsmoHLR db format.
Anticipate future command line options like "import-csv", so keep the code
generalized.
Change-Id: I0dfa6ec033dd93161c1adc2ce1637195fe5b7a63
Neels Hofmeyr