Merge pull request #1152 from ximenesuk/chgrp-delete-python-tests

Python chgrp and delete tests for MIF
Single line changes from @mtbc
Resolve type cast exception wrt column types (fix #10891)
Use HashMultimap in Preprocessor
Add see #10894 comment to BaseRenderingTest
Add two tests for delete and chgrp using Fileset as root. Fixes #10896
merge develop -D org -I include -E exclude: PR 1092 (Fileset display)
merge develop -D org -I include -E exclude: PR 1096 (Thumbnail figure develop)
merge develop -D org -I include -E exclude: PR 1132 (Repository API)
merge develop -D org -I include -E exclude: PR 1133 (Code and mapping changes for new schema)
merge develop -D org -I include -E exclude: PR 1138 (Chgrp mif handling 10802)
merge develop -D org -I include -E exclude: PR 1142 (10776 MIF graphs)
merge develop -D org -I include -E exclude: PR 1143 (Delete mif handling 10806)
merge develop -D org -I include -E exclude: PR 1145 (Image metadata download)
merge develop -D org -I include -E exclude: PR 1146 (Download image)
merge develop -D org -I include -E exclude: PR 1157 (Update develop submodules)
merge develop -D org -I include -E exclude: PR 1158 (Sort Original Metadata by keys. See #10861)
merge develop -D org -I include -E exclude: PR 1161 (Notification fs)
merge develop -D org -I include -E exclude: PR 1164 (blitz: Remove hardcoded LIBPATH additions)
merge develop -D org -I include -E exclude: PR 1165 (Import status tb)