* DVS driver - wrong directory check - driver build failed
  even if current kernel headers are present (at least under Debian)
* perf - dispose shared memory (TODO: dispose also with UG)
* DVS - send FPS (was missing)
* compress - fixed flag read

* ship libraries according to portaudio.in
* another small fixes (see log)

* TODO: check pathological states (eg. audio buffers overrun etc.)

+ minor audio refactoring

* build - linker g++ for FastDXT
        - do not require Xext
* portaudio fix - work even if there is no sound card

* fixed DeckLink driver build on recent kernels (~3.0)
* fixed build on CentOS (omitted libraries)

* fixed wrong destriptor set (UDP)
* SDL - read display resolution only on first time

Conflicts:
	ultragrid/src/main.c
	ultragrid/src/video_capture/dvs.c
	ultragrid/src/video_capture/dvs.h

+ SDI audio currently for quad, decklink and testcard only
+ some other fixes (see log)

Operators '<<' and '>>' have quite a low precedence so using it
unenquoted can cause problems in some expressions.

+ auto(re)configuration

* some fix included in order to compile on newer kernels (driver)
* thanks to Milos Liska

Other changes:
* added dependency on SDL for testcard
* TODO: consider more cleanups (removing all X checks from
  configure.ac etc.)
* dropped check for GLU (no longer needed)

* minor code cleanup in QT

* there was some irrational glibc corruption when copying into
  SDL_Surface v210 data

* it was unstable somehow, anyway cmdline string still works

* removed busy waiting
* allowed to compress any video that is divisible by 4 in both
  dimensions
* add optional argument to '-c' specifying number of compressing threads

* do not build perf on gcc < 4.1 (current Xcode's default gcc)

* frames are not generated now, instead a pointer moves accross 2 copies
  of image

* dropped unnecessary options from main