Add UDS and AEGIS to the RGB thumbnail scripts.  For now, fill regions lacking CANDELS coverage in AEGIS with two-color F814W + F140W.  
Add UDS and AEGIS to the RGB thumbnail scripts.  For now, fill regions lacking CANDELS coverage in AEGIS with two-color F814W + F140W.  

git-svn-id: b93d21f79df1f7407664ec6e512ac344bf52ef2a@831 f9184c78-529c-4a83-b317-4cf1064cc5e0

gbrammer/unicorn,gbrammer/pygrism,gbrammer/pygrism,gbrammer/unicorn