Don't unload blocks if save failed

Improve error handling in saveBlock()
Don't copy back already generated blocks on map generation
Faces shading fixes
Switch back repository to dev-mode after 0.4.10 release.
Update default control documentation
Remove math mapgen
Remove indev mapgen
Remove proller from credits
Move MapBlock (de)serializing code out of Database class
Fix crash reported here: https://forum.minetest.net/viewtopic.php?f=6&t=9726
Fix android build after removal of indev and math mapgen
Add srollbar formspec element
Fix flipped textures for drawtype "glasslike"
Fix indexing error in timer processing
Permit non-integer sizes for item_image[]
Make tooltip_show_delay=0 work
Fix error handling on inconsistent client ready message
Fix android makefile to provide a correct dummy githash if detection fails
Fix texture hack in fences.
Fix texture glitches for plants with visual scale > 1.0 (jungle grass).
Speedup mapblock_mesh