increment iterator was forgotten
Merge branch 'master' of https://github.com/52North/IlwisCore.git
added guard
better way of doing id2resource
Merge branch 'master' of https://github.com/52North/IlwisCore.git
Merge branch 'master' of https://github.com/52North/IlwisCore.git
Merge branch 'master' of https://github.com/52North/IlwisCore.git
Merge branch 'master' of https://github.com/52North/IlwisCore.git
expression are acceptable with remote datasources of unknown type. even
if the type is incorrect the prepare of the operation will catch it.