Kermeta version to be consolidated

[jdeantoni]

There are currently several versions of Kermeta in the different pom.xml. Some of them are very old.
Here is a list of the different version:

• gemoc-studio/gemoc_studio/pom.xml: http://www.kermeta.org/diverse-commons/updates/latest
• gemoc-studio/pom.xml: <k3.p2.url>http://www.kermeta.org/k3/update_2019-09-30/</k3.p2.url>
• gemoc-studio/pom.xml: <ale.p2.url>http://www.kermeta.org/ale-lang/updates/2020-11-09/</ale.p2.url>
• gemoc-studio/pom.xml: <diverse-commons.p2.url>http://www.kermeta.org/diverse-commons/updates/latest</diverse-commons.p2.url>
• gemoc-studio-execution-moccml/pom.xml: <k3.p2.url>http://www.kermeta.org/k3/update_2018-09-05</k3.p2.url>
• gemoc-studio-execution-moccml/pom.xml: <diverse-commons.p2.url>http://www.kermeta.org/diverse-commons/updates/latest</diverse-commons.p2.url>
• gemoc-studio-moccml/pom.xml: <k3.p2.url>http://www.kermeta.org/k3/update/</k3.p2.url>
• gemoc-studio-moccml/pom.xml: <diverse-commons.p2.url>http://www.kermeta.org/diverse-commons/updates/latest</diverse-commons.p2.url>
• gemoc-studio-modeldebugging/pom.xml: <k3.p2.url>http://www.kermeta.org/k3/update_2018-09-05</k3.p2.url>
• gemoc-studio-execution-java/pom.xml: <k3.p2.url>http://www.kermeta.org/k3/update_2018-09-05</k3.p2.url>
• activitydiagram/dev/pom.xml: http://www.kermeta.org/k3/update/
• gemoc-studio-execution-ale/pom.xml: <ale-repo.url>http://www.kermeta.org/ale-lang/updates/2020-07-17</ale-repo.url>

Since Kermata is quite stable I propose to use the "latest" repo for all poms, i.e. http://www.kermeta.org/k3/update/

Please check if OK with the ALE repo; the others seems ok

[dvojtise]

actually, you are referring to 3 different update sites ALE, K3, and DiverSE Commons.

for K3, even if I prefer using references to reproducible update sites (in order to ensure to not have regression due to a change in an external source), you're right K3 is quite stable and http://www.kermeta.org/k3/update refers only to validated versions (and not nightly versions) so we can try to use it.