* app/composite/gimp-composite.c (gimp_composite_init): Print the
list of active instruction sets if the --verbose command line
switch is ON (via be_verbose)

* app/composite/gimp-composite-x86.h: Factored code from the mmx,
and sse implementations.

* app/composite/make-installer.py: Raised the number of test
iterations from 1 to 10.

* app/composite/gimp-composite-3dnow.[ch]
* app/composite/gimp-composite-3dnow-test.c
* app/composite/gimp-composite-3dnow-installer.c
* app/composite/gimp-composite-altivec.[ch]
* app/composite/gimp-composite-altivec-test.c
* app/composite/gimp-composite-altivec-installer.c
* app/composite/gimp-composite-mmx.[ch]
* app/composite/gimp-composite-altivec-test.c
* app/composite/gimp-composite-altivec-installer.c
* app/composite/gimp-composite-sse.[ch]
* app/composite/gimp-composite-sse-test.c
* app/composite/gimp-composite-sse-installer.c
* app/composite/gimp-composite-sse2.[ch]
* app/composite/gimp-compos...