Fix three tech tree bugs, relevant for mods like Delenda Est.
tree0e315b515d161a839098434ce9e924ecb8ce0932
-rw-r--r-- 91 .arcconfig
-rw-r--r-- 2125 LICENSE.txt
-rw-r--r-- 1397 README.txt
drwxr-xr-x - binaries
drwxr-xr-x - build
drwxr-xr-x - docs
drwxr-xr-x - libraries
-rw-r--r-- 10104 license_dbghelp.txt
-rw-r--r-- 17987 license_gpl-2.0.txt
-rw-r--r-- 26434 license_lgpl-2.1.txt
-rw-r--r-- 1065 license_mit.txt
drwxr-xr-x - source