Examine the converse header fields for all layers and remove/reduce fields wherever applicable
While implementing the ZC Bcast Send API, we came across several fields that could be potentially reduced/removed for the GNI layer. (https://charm.cs.illinois.edu/gerrit/c/charm/+/4395).
This could be the case for other layers too. For that reason, it's worthwhile to examine all converse header fields from every active layer and reduce the total size of the header.