handle '@' in postgres text fields

[marc1uk]

currently the config pages fail to insert records if text fields (such as name or description) contain the '@' character.
the resulting output from sqlquery.cgi was:

got request with user: 'root', db: 'daq', '
        INSERT INTO configurations (time, name, version, description, author, data)
        VALUES ( now(), 'webtest', (select COALESCE(MAX(version)+1,0) FROM configurations WHERE name='webtest'),
                 ' hello this is an information message ..![][]<>?/`~'@'', 'marcus', '{"five":5}'::jsonb)
    '
query return: 'ERROR:  operator is not unique: unknown @ unknown
LINE 4: ...ello this is an information message ..![][]<>?/`~'@'', 'marc...
                                                             ^
HINT:  Could not choose a best candidate operator. You might need to add explicit type casts.'

[marc1uk]

solved by using uriencode in #30