Tiny change in keyboard shortcuts.

1. Add a keyboard shortcut 'h' as an alias for '?'. 'h' is quite common.
2. Advertise it in the banner, so people can discover all the other
shortcuts. Feel free to change the wording.
Fix missing --all-sequences in help message

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Merge pull request #6 from eltoder/help-keys

Tiny change in keyboard shortcuts.
Minor changes in driver description

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update documentation with h command

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Don't call deinitialization from signal handler

Eugene Toder reports:

When I abort the playback using Ctrl-C I get the following error:

Assertion 'pthread_mutex_destroy(&m->mutex) == 0' failed at
pulsecore/mutex-posix.c:83, function pa_mutex_free(). Aborting.
Aborted (core dumped)

This happens because xmp registers a signal handler for SIGINT that calls
sound->deinit(). For the PulseAudio driver this calls pa_simple_free(),
which is apparently not happy to be called from a signal handler. Commenting
out the call to deinit() fixes the problem, and seems to work well for both
OSS and PulseAudio.

Generally speaking, calling deinit() from a signal handler is dangerous --
it's likely to call free() or similar, which is not signal safe. Is this
necessary? If the idea is to have a graceful shutdown on Ctrl-C, the handler
should set a flag or use longjmp() to exit the play loop in main(). Also,
attempting a graceful shutdown for SIGFPE and especially SIGSEGV is probably
not a good idea.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update documentation

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Enable silent build by default

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update version number

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>