tasks #7432: SOAP for datetime

- getArtifact(s) and Tracker Reports do not return datetime fields
- you cannot add a dateime field in new artifact
- you cannot update a datetime field in an artifact
- getTrackerStructure() and getTrackerFields() ignore every field that is datetime
- getArtifactHistory() ignore datetime fields

Change-Id: I478642a773f1a9d3d748d10cfdc1e06003778911
tasks #7438: align checkbox in field admin area

Change-Id: I5b5638c98c8621a62c68ea576b0048a3628b5c8f
tasks #7439: remove usage of seconds

Change-Id: Ibf7d7964554b6181043e808e649233d2c5888d9f
Merge commit 'refs/changes/99/2999/2' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7439: remove usage of seconds
  tasks #7438: align checkbox in field admin area
  tasks #7432: SOAP for datetime

Change-Id: I024590309331bf9dce38f9200be56ad1bd2c6349
Tuleap 7.4.99.25

Change-Id: I7c9ef02d43c75de5ea493ff45ae1cc7b358a8387