I've made a number of small checkins tonight . . .
At Grant's request, I added a texture map (medium and low res versions)
for Enceladus. The map is a slightly modified version of Phil Stooke's
mosaic; the only change was filling a small gap in the south polar area.
I implemented different symbols for markers. The only way to choose a
symbol other than the default diamond is to use the script command mark.
The command now takes a parameter symbol that can be one of the following
strings: diamond, plus, square, x, or triangle.
I fixed the 'blue galaxies' bug, caused by interactions between nebula and
And, I changed M82 to M81 in the base galaxies file; Selden noticed that