including S24_LE/BE formats to linux alsa driver
Merge pull request #76 from ricardocrudo/master

including S24_LE/BE formats to linux alsa driver
Set NetJack2 auto-connect and auto-save from environment variables

The variables are JACK_NETJACK_AUTOCONNECT and JACK_NETJACK_AUTOSAVE.
This makes it possible to launch a jackd process with netmanager auto-loaded
(-I netmanager) with a single command line.
It was already possible to load netmanager using jack_load with "-c -s" as
initialization string, but this was a two steps operation and it was mandatory
to wait some time between them because under heavy load (e.g during boot time)
the jackd socket would not be ready immediately.
Promiscuous: allow to skip audio reservation

Setting the JACK_NO_AUDIO_RESERVATION environment variable let one skip the
audio reservation bits.
The main use case is a system-wide jackd promiscuous instance launched at boot
time, for which no session bus is available.
Promiscuous: allow to set group ownership of sockets, semaphores and shm

If the value of the JACK_PROMISCOUS_SERVER environment variable is set to the
name or gid of a valid UNIX group for the current user, then all filesystem
objects (e.g. sockets, semaphores and shared memory segments) will be created
with this group as owner, and the permissions will be set to 0660.
If not, the permissions will be set to 0666.
This remove the requirement to use a too permissive umask for promiscuous mode
to work properly.
Split JackWaitThreadedDriver's Execute method

This makes it possible to use JackWaitThreadedDriver as a base class
for a non threaded version.
Add JackWaitCallbackDriver

This wrapper driver has the same usasge as it's parent JackWaitThreadedDriver,
but for non-threaded (e.g. callback) drivers. After waiting for Initialize to
return, its main thread simply ends instead of calling the driver's Process
method in a loop. The decorated driver, which must extends JackRestarerDriver
instead of JackWaiterDriver, can restart the wait cycle by calling its
RestartWait method.
Add JackProxyDriver

This driver is very similar to the JackNetDriver, but instead of connecting
through the network, it connects to its upstream server through standard jack
API. So it can only reach local servers which must be running as the same user
or in promiscuous mode.