fix for Issue 828: Manual placement animation is drawn twice
test case that spawns 2000 mines in a pit. run with ctest -R mines  # only works if cmake was ran after pulling this commit
Add scheme and weaponset for Construction Mode.
move failing test into "todo" folder so that it can be excluded with ctest -E '^todo/'

--HG--
rename : tests/lua/twothousandmines.lua => tests/lua/todo/twothousandmines.lua
extra : rebase_source : 29ebfe7f9eaf235f83a58c58497de4af880aa548
Skip checkin on collision for frequently spammed gear types if collision gets huge instead of trying to delete mines.