[OE-3781] added generate sessions button the sequences admin view and moved the generateSessions code into the api class.
[OE-3782] disallow setting "None" in the interval dropdown for new sequences.
[OE-3781] removed commented generateSessions code
Merge branch 'release/1.5' into develop
Merge branch 'release/1.5' into develop
Merge branch 'release/1.5' into develop