docs: added all the (at this time) known problems

documentation/KnownProblems.txt

@@ -6,6 +6,8 @@ Known Problems
 Known Problems in Release 2.1.5
 -------------------------------
 
+These are all fixed in the latest snapshot.
+
 * Using pvPutComplete or pvGetComplete inside a when-clause may
   result in a deadlock: the state set forever waits for the
   completion even though the callback arrived.
@@ -17,8 +19,6 @@ Known Problems in Release 2.1.5
   epics thread priorities are reversed (or ignored, as is typically
   the case for soft IOCs running in user mode on Linux or Windows).
 
-  The latest snapshot has this bug fixed.
-
 * In safe mode, if a variable is monitored and sync'ed, it can
   happen that an event is detected with efTestAndClear
   but the underlying variable still has the old value.
@@ -30,8 +30,28 @@ Known Problems in Release 2.1.5
   clear the flag in the action block only after you have actually
   got the new value.
 
-  A fix for this problem will appear in 2.1.6.
+* The asynchronous versions of pvPut and pvGet built-in functions
+  do not behave correctly in case of connection loss. Particularly,
+  if connection is lost when waiting for completion, the state set
+  that issued the command will not be woken, so that it will wait
+  for the full timeout (the hard-coded 10 seconds).
+
+  Thanks to Daniel Keating for finding
+  this bug and pointing me in the right direction how to fix it.
+
+* The compiler crashes when an assign clause lists more PVs than
+  the array contains elements.
+
+* The compiler reports wrong line numbers (and could potentially
+  crash, though I did not experience this) when SNL or C code is
+  included with an un-escaped preprocessor #include command.
 
+* In safe mode, anonymous PVs deviate from named PVs in the behaviour
+  of event flags: Normally, event flags for monitored PVs will be
+  set when entering the first state because of the first monitor event
+  we get from CA after connecting. This should be emulated for
+  anonymous PVs in order to restore the symmetry and so that named
+  and anonymous PVs can be interchanged at will (as claimed in the docs).
 
 .. _Known_Problems_2.1.4: