getArrayDtype can be used for example by html5 app to display graph with correct dtype

data model: split ingestion policy script (tag parsing) form ingestion operation (writing to data stream)

Interaction workflow could still be used to call the alarm right after appending to data stream

@Tyagov @kirr Configuration is currently done through python script, this could be improved. In current design, if messages cannot be forwarded as fast as new messages come in, some messages will be skipped.

/reviewed-on nexedi/wendelin!22

While investigating fixes to https://nexedi.erp5.net/bug_module/20151207-1789A61 I found that it was impossible to reproduce this bug in Wendelin tests due to a bad configuration of how WendelinInformationGadget was installed.  Now I can Wendelin tests (still get a different problem though, which is subject for another PR or bug report).

Please review, @Tyagov.

/reviewed-on nexedi/wendelin!20

/reviewed-on nexedi/wendelin!19

So that it can be selected as "Product or Service" in Data Analysis Line

And also allows the user to choose to not install it.

A proper warning with regards to remote code execution is displayed,
even though it could only happen if the "attacker" has valid ERP5
credentials.

@Tyagov, please review.

/reviewed-on !18