Merge skiboot-5.1.13 release notes

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+skiboot-5.1.13
+--------------
+
+skiboot-5.1.13 was released on Wed January 27th, 2016.
+
+skiboot-5.1.13 is the 14th stable release of 5.1, it follows skiboot-5.1.12
+(which was released December 4th, 2015). This release contains bug fixes.
+
+General:
+- core/device.c: Sort nodes with name@unit names by unit
+  - This gives predictable device tree ordering to the payload
+    (usually petitboot)
+  - This means that utilities such as "lspci" will always return the same
+    ordering.
+- Add OPAL_CONSOLE_FLUSH to the OPAL API
+  uart consoles only flush output when polled.  The Linux kernel calls
+  these pollers frequently, except when in a panic state.  As such, panic
+  messages are not fully printed unless the system is configured to reboot
+  after panic.
+
+  This patch adds a new call to the OPAL API to flush the buffer.  If the
+  system has a uart console (i.e. BMC machines), it will incrementally
+  flush the buffer, returning if there is more to be flushed or not.  If
+  the system has a different console, the function will have no effect.
+  This will allow the Linux kernel to ensure that panic message have been
+  fully printed out.
+
+CAPI:
+- hmi: Identify the phb upon CAPI malfunction alert
+  Previously, any error on a CAPI adapter would assume PHB0.
+  This could cause issues on Firestone machines.
+
+gard utility:
+- Fix displaying 'cleared' gard records
+  When a garded component is replaced hostboot detects this and updates the
+  gard partition.
+
+  Previously, there was ambiguity on if the gard record ID or the whole gard
+  record needed to be erased. This fix makes gard and hostboot agree.
+
+firestone platform:
+- fix spacing in slot name
+  The other SlotN names have no space.