some work on php-composer main package

ok, I've managed to unbundle the vendor libs. As far I can tell composer is working and the system libs are used.

Main reason I upgraded to a recent snapshot is that there is now a working "use-include-path" option (it configures the class loader to look for classes in the php include dirs).

the test suite needs some love, works fine if run it manually on command line. Dunno whats going on.