User visible changes
* EXT:GETENV is now setfable.
* Hostname resolution is now optional in
EXT:SOCKET-STREAM-PEER and EXT:SOCKET-STREAM-LOCAL.
* EXT:SOCKET-STATUS now accepts SOCKET-SERVERs too
and the direction of the checks can be specified.
* Added install.bat for win32 installation.
* ANSI CL compliance: more conformant pathname handling.
* Fixed handling of circular structs and pointers to functions in the FFI.
* Fixed binary I/O for streams with element type longer than one byte,
but not a whole number of bytes.