* Add virtual destructors to CnfStream, Theory, OutputChannel, and

* Add virtual destructors to CnfStream, Theory, OutputChannel, and
  ExplainOutputChannel.  Safer and stops a compiler warning.

* node attributes: fix compiler warnings on 64-bit.

* Node: add asserts to make sure the current NodeManager is non-NULL
  when it's needed.  This can happen when public-facing functions
  don't properly set the node manager, and it can look like a bug in
  another part of the library.  Also some code format cleanup.

* configure.ac, config/cvc4.m4: added --enable-static-binary (see
  discussion on bug 32), fixed bad configure lines (bug 19), added
  documentation for some things.

* config.h.in: removed; it's auto-generated.