Many small changes

1. Attempt to speed up/prevent timeout chart drawing by moving SQL
execution before start of drawing
2. And turn off anti-aliasing
3. Move several more icons into the sprite palette
4. Move log-in function to top of page (in prep for a REAL log-in.  For
now use the PW hard coded in config.php and ANY made up user name)
5. Move JavaScript to it's own file in the resource directory.
6. Fix bad handling of cookie "false" value
7. Add backup function!  (Have to manually visit the backup.php web page
for now, but hey, it's in there!)
8. New page background image (cool huh?  Ugly as sin when you switch to
Icy theme though)