Added notes from HISTORY

UPDATE-2.0.0

@@ -78,6 +78,11 @@ Plugins:
   + The default table id for a newly created cEvent has been changed to 0xFF,
     which is higher than any normal table id that is broadcast in the EIT data.
   See PLUGINS.html, section "Electronic Program Guide" for more information.
+- The cThread constructor now has an additional boolean parameter that can be set to
+  true to have this thread run at a lower priority. Plugin authors that use low
+  priority threads may want to use this instead of the calls to SetPriority(19) and
+  SetIOPriority(7). The priority of a thread ("low" or "high") is now logged when the
+  thread starts.
 
 Skins:
 
@@ -330,6 +335,12 @@ Recordings:
 - If a frame position in the 'marks' file of a recording doesn't point to an I-frame,
   it will now be shifted towards the next I-frame (either up or down, whichever is
   closer).
+- Editing marks can now be placed directly on top of each other, in which case they
+  simply mark a position, but have no effect on the actual cutting process.
+- When positioned at an offset where two (or more) editing marks are placed on top
+  of each other, the '4' key moves the first one of them to the left, while the '6'
+  key moves the last one of them to the right. The '7' and '9' key handle multiple
+  marks at the same place as if it were one single mark.
 
 SVDRP: