ignore warnings from OpenCV headers
resolve conflicts on merge with upstream master
re #19385: first version of PNG import

works for size <= 128px
re #19385: fill gaps between neighbourhood voxels
re #19385: use right neighbour voxels
re #19385: importing voxels should be destructive
re #19385: add hot-fix to allow import of big PNGs

sendVoxelsOperation() is sending data too fast, printf slows it down.
Better fix is required.
re #19385: use righ axis name
remove a couple of unused variables in the domain-server
add return of number of alive agents from AgentList
split logstash stash methods to stat types
send count of alive nodes to logstash from DS
re #19385: CR changes
Merge remote-tracking branch 'worklist/master' into 19385
Merge pull request #607 from heracek/19385

Code Review for Job #19385
Merge pull request #599 from PhilipRosedale/master

3P transition turned off, field of view now in preferences
DRY up multiple stat type sending
Merge pull request #609 from birarda/domain-stats

rework Logstash to handle various stat types, add domain server node count stat
rename the stat type argument in Logstash
Merge pull request #610 from birarda/domain-stats

rename argument for Logstash stat stash