This avoids conflict with FiveAM. Closes #7.

Version number is now up to date with with the release tag. Added description,
homepage, source control, bug tracker and maintainer info.

Closes #8.

In purge-cache function declare variable uid=1000(dvk) gid=1006(dvk) groups=1006(dvk),10(wheel),18(audio),19(cdrom),27(video),35(games),85(usb),250(portage),1005(plugdev),1013(vboxusers),1017(scanner),1020(dropbox) as ignorable

- If error-code is NIL, error message is undefined too.
- Prepare-statement should clear bindings when using
  cache, or the result won't be identical in behavior
  to a new object.

This allows improved diagnostics and condition
handling opportunities. Since the constraint
error is likely to provoke special handling,
it is branched off into a separate type.

Multiple-value-prog1 is a special operator designed
specially for cases like this one.

This would ensure an immediate failure at lisp level if
they are accessed later by mistake, instead of a segfault.

DISCONNECT ensures that all statements are closed (prevents exceptions during database close); added with-database macro