Miscellaneous fixes for 1.10

[bennylp]

This is placeholder ticket for miscellaneous/minor fixes on this release.

[ming]

(In [3411]) Re #1175: Modified default core audio unit used on iOS from VPIO to RemoteIO. To use VPIO, application needs to specify a nonzero value for the PJMEDIA_AUD_DEV_CAP_EC capability.

[ming]

(In [3413]) Re #1174: fixed crash when pjsua is restarted, causing inClientData to be invalid since AudioSessionInitialize? can only be called once.
Re #1175: cleaning up interruption and audio route handling in coreaudio for iOS. In the case of interruption, there is no need to reinstantiate the audio unit (a simple restart will do), while for audio route change, nothing needs to be done.

[nanang]

(In [3414]) Misc (re #1175): fixed possible division-by-zero bug when receiving problematic G722 payloads (e.g: sized less than 160 bytes) and remote clock-rate/timestamp-span detection is active (PJMEDIA_HANDLE_G722_MPEG_BUG is set). Thanks Erik Waling for the patch.

[nanang]

(In [3415]) Misc (re #1175): fix sample app pcaputil.c bug, it always fails in reading the first/reference packet when the codec is not PCMU (default payload type was hardcoded to zero/PCMU).

[bennylp]

In r3421:

• fixed realclean and distclean target for Python makefile

[bennylp]

(In [3427]) Misc (re #1175): fixed link error in OpenBSD 4.6 caused by lack of sched_get_priority_min() and sched_get_priority_max()

[ming]

(In [3443]) Misc (re #1175) (thanks to Seth Hinze for the patch):

• uri_test: Fixes a divide by zero error when the benchmark is run on a really fast machine.
• presence: Fixes a compiler warning about potential referencing of an uninitialized variable.
• echo_speex: Allow for compilation when PJMEDIA_HAS_SPEEX_AEC is not defined.

[ming]

(In [3454]) Re #1175 (Misc): coreaudio fixes:

• Setting audio session category is now during stream creation instead of in the factory initialization.
• Reset the audio session category after an interruption.
• By default, audio route change property listener is disabled as it is no longer required.

[ming]

Release [3454] was issued a new ticket #1210.

[bennylp]

(In [3475]) Misc (re #1175): added protection against broken pipe exception in python unit test when handling error

[nanang]

(In [3549]) Re #1175: Set SVN properties for several files: keywords=id and eol-style=native

[nanang]

(In [3551]) Re #1175: (Continuing r3549) Set SVN properties for some ipjsystest files: keywords=id and eol-style=native.