add API-CHANGES-0.6 describing API changes between 0.5.x and 0.6

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@868 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe

diff --git a/docs/API-CHANGES-0.6 b/docs/API-CHANGES-0.6
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+-*-text-*-
+
+
+A terse list of API changes between 0.5.2 and 0.6:
+
+ * Most browsing and registration functions and their callbacks gained
+   new "flags" parameters. Passing 0 results in similar behaviour as
+   in 0.5.2
+
+ * avahi-client/client.h has been split into client.h, publish.h and lookup.h
+ 
+ * avahi-core/core.h has been split into core.h publish.h lookup.h
+
+ * avahi_client_is_service_local() has been removed. The special flags
+   AVAHI_LOOKUP_RESULT_LOCAL and AVAHI_LOOKUP_RESULT_OUR_OWN which are
+   set when resolving or browsing for
+   services. AVAHI_LOOKUP_RESULT_OUR_OWN is what most people should
+   use.
+
+ * AVAHI_RESOLVER_TIMEOUT and AVAHI_RESOLVER_NOT_FOUND have been
+   removed. Instead AVAHI_RESOLVER_FAILURE is used and the exact error
+   code is available from avahi_client_errno()/avahi_server_errno()
+
+ * The events AVAHI_BROWSER_CACHE_EXHAUSTED, AVAHI_BROWSER_ALL_FOR_NOW
+   have been introduced. Failures during browsing are now passed as
+   AVAHI_BROWSER_FAILURE and the error code is made available through
+   avahi_client_errno()/avahi_server_errno().
+
+ * The server gained a new state AVAHI_SERVER_FAILURE if some fatal
+   error happens. The reason can be found in
+   avahi_server_errno(). Clients can safely ignore this state.
+
+ * You can now update existing records by setting the
+   AVAHI_PUBLISH_UPDATE flags for add_service() and friends. Consider
+   using avahi_server_update_service_txt_strlst() if you need to
+   update only the TXT record for a service.
+
+ * Proper support for service subtypes is now available. Use
+   avahi_server_add_service_subtype() for that.
+
+ * Entry groups gained the new state AVAHI_ENTRY_GROUP_FAILURE. The
+   reason is available using
+   avahi_server_errno()/avahi_client_errno().
+
+ * Many superfluous functions have been removed from the public API or
+   entirely.
+
+ * avahi_simple_poll_iterate() has been split up into three
+   functions. avahi_simple_poll_loop() has been introduced.
+
+ * Some new limits have been introduced: AVAHI_ADDRESS_STR_MAX,
+   AVAHI_DOMAIN_NAME_MAX, AVAHI_LABEL_MAX
+
+ * The functions avahi_service_name_join() and
+   avahi_service_name_split() have been introduced.
+
+$Id$