Note that _protocol abbreviations_ and friends are not localisable!

Should fixe #1635

Fix two potential segfaults.
Cosmetics.

Note that an upper limit should be set anyway

Export update_GetRelease() to the plugins
Modify qt4 & wx GUIs to reflect this change

Note: public key v3 signatures are not supported
Fix various bugs and potentials buffer overflows

The problem came from my misreading of the API
This commit also fix potential misunderstanding by simplifying it further

This improves readability a lot and prevent us from reinventing the wheel.

check if the binary signature was issued by the public key we got in memory, before real cryptographic verification

misc/objects.c: Don't rely on vlc_object_destroy() to destroy objects, but expects vlc_object_release to do it when the refcount goes to zero.
* Meaning, that when created objects gets a refcount to 1.
* Destroying is instantaneous and we don't have to poll for a few secondss or so to wait until the object's refcount reach 0.
* We now track vlc_object_t's mem leaks when libvlc_global is released (Hard error for now, so they don't get unoticed)
* We fail hard if an object is released with a refcount of 1 without being detached from its parent and its children, to make sure such cases don't go unoticed.
(make test or make check still pass after that one. VLC is known to leak one object when no module is loaded, this must be fixed).

update the release documentation, only supported signatures are v3 signatures (gpg 2.x generates v3 sigs by default, but not gpg 1.x)

Fix error in gpg signature verification function. Gcrypt is responsible for freeing the value returned by gcry_md_read, so we shouldn't free it ourselves but use gcry_md_close instead.

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.

use intf_UserFatal when an error occurs while verifying the binary

update: put pgp key in its own header (and update the key to 2008), put a FIXME for some bug discovered (some signatures are smaller than 65 bytes), be more verbose when a problem happens.