Need to add pad bytes to sample count.

DMX sfx include the 32 pad bytes on either end in the sample count in
the header.
Basic work on output format, and move i_opndir
Ability to extract movie.str from raw CD image
Fix up the Makefile, add clean, install, check targets

The executable name can now by changed with TRGT, the SRCS array now
includes every file except i_opndir.cpp (which is unneeded on POSIX
platforms), and there is now an install target which supports the
standards PREFIX and DESTDIR variables commonly seen with Autotools
projects. The "make clean" target is capable of removing all the
objects.

Additionally, change the -std=c++0x to -std=c++11 which is the new
form that should be used instead.
Add *.pke and *.str to .gitignore