reprint badge: improve performance on search

[cbellone]

We should save first, last name and email address directly as columns and use them in the where clause instead of searching into the JSON Blob

[syjer]

additional possible improvements (http://www.hsqldb.org/doc/2.0/guide/dbproperties-chapt.html): enable compression of clob/lob and the script -> less data to write and read from the sdcard

• hsqldb.lob_compressed to true
• hsqldb.script_format to 3 -> for compression

[syjer]

use the following jdbc url: jdbc.url=jdbc:hsqldb:file:alfio;hsqldb.lob_compressed=true;hsqldb.script_format=3

(database must be recreated)

[syjer]

note: in theory it should be way faster now. To check!