Merge pull request #651 from a-chumagin/master

Fix dataPicker unit tests
Bug #586: Creation of several content items for one time
[Hotfix] Bug #663. Timeline: Incorrect time interval for timelines which "end" is less than 1 BCE.
Merge pull request #632 from javierluraschi/Fix586

Bug #586: Creation of several content items for one time
Merge pull request #664 from alex-zen/hotfix

[Hotfix] Bug #663. Timeline: Incorrect time interval for timelines which "end" is less than 1 BCE.
added a new test case