Allow alpha to adjust brightness of mesh objects.

so "run" command can do it too.

No time for more changes (by slevy) this weekend.

More changes to come, but not this weekend.

polyorivar and texturevar now accept field names as well as numbers.

Fix &basis(): don't abandon hope unless very nearly degenerate.
&dms2d() now accepts colon-separated values.

CONSTify input strings where possible.

alias or not!

Then "txscale .5" always shows entire texture regardless of polysides.
Add new "ptsize" command -- makes more sense than "fast".  "fast" still works.

Then, for "polysides 4" and "txscale .707",
the vertices coincide with the corners of the 0..1 texture.

Stick current alias on logslum slider -- there's room enough.

strips are picked.

Object aliases: "object gN=ALIAS", or in command mode, "gN=ALIAS".
Accept "ellipsoid" data tag; not yet implemented.