Master Releases/Sub releases Merged

Provide the option to allow sub-releases to have independent deliveries versus the Master Release.  This is needed to group on Release GANNT chart releases together, but the delivery dates need to be independent of the Master for presentation. 

Example:

MS-Release has a delivery date of 5/1/2019
Sub-release1 has a delivery date of 3/1/2018
Sub-release2 has a delivery date of 7/1/2018
Sub-release3 has a delivery date of 12/1/2018
Sub-release4 has a delivery date of 5/1/2019

Aha! today makes already sub-releases inherit the master release

MS-Release has a delivery date of 5/1/2019
Sub-release1 has a delivery date of 5/1/2019
Sub-release2 has a delivery date of 5/1/2019
Sub-release3 has a delivery date of 5/1/2019
Sub-release4 has a delivery date of 5/1/2019