Testsuite: added support for testing binaries stored on disk.

Makefile.am

src/testsuite/Makefile.am

src/testsuite/cmd-test-binary.c

src/testsuite/ext-testsuite.c

src/testsuite/testsuite-binary.c

src/testsuite/testsuite-binary.h

src/testsuite/testsuite-common.c

src/testsuite/testsuite-common.h

src/testsuite/testsuite-script.c

src/testsuite/testsuite-script.h

tests/execute/examples.svtest