Add missing fields in CERL Thesaurus reader

[tijmenbaarda]

Including, but not limited to, place of activity

[tijmenbaarda]

SBTI seems to have the same issue according to Jeroen; check

[tijmenbaarda]

Also includes activity timespan and perhaps also activity

[tijmenbaarda]

There is also a problem with the names. cni00085483 (Stichter, Cornelis Jansz, I)