ISI and ISIWI Series example / disambiguation of ISI acronym

[WolfgangFahl]

https://dblp.org/db/conf/isiwi/index.html and https://dblp.org/db/conf/isi/index.html are two series using the same acronym ISI.

There are e.g two distinct ISI 2017. The isiwi series is a biannual conference with a german proceedings series while isi is annual.

The distinction can be easily made via the year and city and/or the proceedings e.g.
ISI 2017, 2017, Berlin, Germany, ISBN 978-3-86488-117-6 is different from
ISI 2017, 2017, Bejing, China, ISBN 978-1-5090-6727-5

[WolfgangFahl]

Fixing #209 with #220 is a prerequisite to get the disambiguation working as per #164 and #42