When jack_connect is called without any argument, it causes a segfault
in

                snprintf( portA, sizeof(portA), "%s", argv[argc-1] );
                snprintf( portB, sizeof(portB), "%s", argv[argc-2] );

Reported in http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=662199

alsa_in/alsa_out need to close the ALSA device they use when freewheeling starts and then reopen it, along with reset resampling parameters, when it ends. this avoids bizarre behaviour during freewheeling as they try to do audio i/o with a still open PCM device

Fix alsa_in build error

memops.h has been moved from the public jack headers residing in jack/
to include/.