Miscellaneous fixes (backported to 1.x)

[ming]

In 4212:

Re #1559: Add doc about on_incoming_subscribe() to call pjsua_pres_notify() immediately after setting the code to 202

[nanang]

In 4217:

Re #1559: fixed uninitialized variable bug in icedemo sample app (thanks Magnus Kempe for the report and the fix!).

[ming]

In 4232:

Re #1559: Add support for OS X version after 10.7.x

[ming]

In 4233:

Re #1559: Removed unnecessary assertion from sock_bsd's pj_sock_recvfrom() implementation.

[ming]

In 4235:

Re #1559: Removed unnecessary PJ_UNUSED_ARG(payload_len) in pjmedia_rtp_encode_rtp()

[nanang]

In r4238: fixed warnings of unused var on Symbian platform.

[nanang]

In 4266:

Misc (re #1559): Consistent use of SAMPLES_PER_FRAME in G711.

[ming]

In 4283:

Re #1559: Fixed potential buffer overflow when duplicating the string

[bennylp]

In 4288:

Misc (re #1559): Require name-addr to have the quote if display name is given. Previously an URI like this will be accepted: "301 301" sip:301@host

[ming]

In 4308:

Re #1559: Fix dependencies when running parallel make (thanks Shaun Ruffell for the patch)

[ming]

In 4312:

Re #1559: Fixed registration timeout setting used by ipjsua to take effect immediately.

[ming]

In 4330:

Re #1559: Related to r4312, get the latest account config first before modifying the account

[nanang]

In 4354:

Misc (re #1559): Added INFO into Allow header for PJSUA.

[nanang]

In 4364:

Sipit30 misc (re #1559): Updated log for SRTP key to use base64 as in the SDP (easier in tracing which key for which stream)

[ming]

In 4366:

Sipit30 misc (re #1559): Increased maximum key length for SRTP crypto key

[ming]

In 4387:

Re #1559: Backported to 1.x, except r4312,r4330

[nanang]

In 4411:

Misc (re #1559): fixed compile errors/warnings on Symbian platform.

[riza]

In 4412:

Misc (re #1559): fixed compile errors/warnings on MSVC

[riza]

In 4414:

Misc (re #1559): add macro PJMEDIA_SDL_LIB to manually specify SDL library name on MSVC