* fhandler_dsp.cc (fhandler_dev_dsp::Audio_out::stop): Add optional

	* fhandler_dsp.cc (fhandler_dev_dsp::Audio_out::stop): Add optional
	boolean argument so that playing can be stopped without playing
	pending buffers.
	(fhandler_dev_dsp::ioctl): Stop playback immediately for
	SNDCTL_DSP_RESET.  Do not reset audio parameters in this case.
	Add support for ioctl SNDCTL_DSP_GETISPACE.
	(fhandler_dev_dsp::Audio_out::emptyblocks): Now returns the number of
	completely empty blocks.
	(fhandler_dev_dsp::Audio_out::buf_info): p->fragments is now the number
	of completely empty blocks. This conforms with the OSS specification.
	(fhandler_dev_dsp::Audio_out::parsewav): Ignore wave headers that are
	not aligned on four byte boundary.
	(fhandler_dev_dsp::Audio_in::buf_info): New, needed for
	SNDCTL_DSP_GETISPACE.