Upgrade from 1.5 to 1.6.

<ChangeLog>

*) Change: "make install" now installs Node.js module as well if it was

configured.

*) Feature: "--local" ./configure option to install Node.js module

locally.

*) Bugfix: Node.js module might have crashed due to broken reference

counting.

*) Bugfix: asynchronous operations in Node.js might not have worked.

*) Bugfix: various compatibility issues with Node.js applications.

*) Bugfix: "freed pointer is out of pool" alerts might have appeared in

log.

*) Bugfix: module discovery didn't work on 64-bit big-endian systems

like IBM/S390x.

</ChangeLog>