Upgrade from 1.6 to 1.7.

<ChangeLog>

*) Change: now rpath is set in Ruby module only if the library was not

found in default search paths; this allows to meet packaging
restrictions on some systems.

*) Bugfix: "disable_functions" and "disable_classes" PHP options set via

Control API did not work.

*) Bugfix: Promises on request data in Node.js were not triggered.

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

*) Bugfix: a segmentation fault occurred in Node.js module if

application tried to read request body after request.end() was
called.

*) Bugfix: a segmentation fault occurred in Node.js module if

application attempted to send header twice.

*) Bugfix: names of response header fields in Node.js module were

erroneously treated as case-sensitive.

*) Bugfix: uncatched exceptions in Node.js were not logged.

*) Bugfix: global install of Node.js module from sources was broken on

some systems; the bug had appeared in 1.6.

*) Bugfix: traceback for exceptions during initialization of Python

applications might not be logged.

*) Bugfix: PHP module build failed if PHP interpreter was built with

thread safety enabled.

</ChangeLog>