Remove the masterfile-format type 'map'
The map masterfile-format is very fragile and it needs API bump every time a RBTDB data structures changes. Also while testing it, we found out that files larger than 2GB weren't loading and nobody noticed, and loading many map files were also failing (subject to kernel limits).
This is the second part of series that removes the format map
completely
from the development release and should not be backported.
Closes #2882 (closed)
Edited by Ondřej Surý