added users "datamanager" and "researcher" for lifelines + do not store "admin" password in source

Added users in the WebAppDatabasePopulator for lifelines.
Part of story:1926 As GL developer I want to prepare demo for lifelines conf

Passwords for these users and profile (website or workspace) should be added to molgenis-server.properties
Password for the admin user should now also be added to molgenis-server.properties

Also did some minor bug fixes.