allow autostart of jackd on OSX where device-names can
contain spaces.

Add  memset to clear buffer to unparse uuid into.

- jack_remove_properties and jack_get_properties both search the metadata database for matching UUID string.
- However, they both fail at finding any matching UUIDs ever.
- The UUID string in the database are correctly created on a previously cleared buffer (e.g. memset to 0).
- The temporaty UUID string in the search routines however are not created on a cleared buffer, the end of the buffer thus may contain anything.
- As in the matching routine the complete UUID strings are compared (with size JACK_UUID_STRING_SIZE), there will never be a matching air, even if their valid part do match.

Forwarded from http://bugs.debian.org/757820

ensures that frame time will reflect any
discontinuity in processing (xrun or skipped cycles). It also cleans up
the code related to maintaining the DLL and frame time a bit, all of it
is now together in jack_run_cycle() and the logic behind it is easy to
follow.

The 'delayed_usecs' argument to jack_run_cycle() is now probably
redundant, the value computed locally (the 'dus' variable) is in
all cases more accurate than what the backend can provide.

ARM clockfix

Without cycle counting, CPU scaling isn't necessarily bad anymore, so we
don't have to worry the user.

The purpose of this commit is to get rid of JACK_TIMER_CYCLE_COUNTER.

The cycle counting clock is no longer supported. For backwards
compatibility with scripts, allow the user to request the cycle clock on
the command line, but use the system clock instead.

We have a proper clocksource in the kernel, use this instead.

This commit also fixes jackd on ARM boards with newer Linux kernels
where /proc/cpuinfo has changed.

Fix for passing pointer to jack_intclient_t.

This code is now part of <jack/types.h>

Note that the -I option is still the correct thing to use if you want more control over setting up one of these clients.