message: Add docs for new engine parameter
diff: @@ -136,7 +136,15 @@ satisfying, but has a similar long-term effect upon the set of steps
  delivered to the readers.) This value is interpreted by SST Writer engines
  only.
  -5. ``DataTransport``: Default **varies**. This string value specifies
  +5. ``ReserveQueueLimit``: Default **0**. This integer value specifies the
  +number of steps which the writer will keep in the queue for the benefit
  +of late-arriving readers. This may consist of timesteps that have
  +already been consumed by any readers, as well as timesteps that have not
  +yet been consumed. In some sense this is target queue minimum size,
  +while QueueLimit is a maximum size. This value is interpreted by SST
  +Writer engines only.
  +
  +6. ``DataTransport``: Default **varies**. This string value specifies
  the underlying network communication mechanism to use for exchanging
  data in SST. Generally this is chosen by SST based upon what is
  available on the current platform. However, specifying this engine
  @@ -152,7 +160,7 @@ applications running on different interconnects, the Wide Area Network
  (WAN) option should be chosen. This value is interpreted by both SST
  Writer and Reader engines.
  -6. ``DataTransport``: Default **tcp**. This string value specifies
  +7. ``ControlTransport``: Default **tcp**. This string value specifies
  the underlying network communication mechanism to use for performing
  control operations in SST. SST can be configured to standard TCP
  sockets, which are very reliable and efficient, but which are limited
  @@ -164,7 +172,7 @@ equivalent to **scalable**. Generally both the reader and writer
  should be using the same control transport. This value is interpreted
  by both SST Writer and Reader engines.
  -7. ``NetworkInterface``: Default **NULL**. In situations in which
  +8. ``NetworkInterface``: Default **NULL**. In situations in which
  there are multiple possible network interfaces available to SST, this
  string value specifies which should be used to generate SST's contact
  information for writers. Generally this should *NOT* be specified
  @@ -177,7 +185,7 @@ will result in SST generating contact information that uses the
  network address associated with the loopback interface (127.0.0.1).
  This value is interpreted by only by the SST Writer engine.
  -8. ``FirstTimestepPrecious``: Default **FALSE**.
  +9. ``FirstTimestepPrecious``: Default **FALSE**.
  FirstTimestepPrecious is a boolean parameter that affects the queueing
  of the first timestep presented to the SST Writer engine. If
  FirstTimestepPrecious is **TRUE***, then the first timestep is
  @@ -187,7 +195,7 @@ can be used to convey run parameters or other information that every
  reader may need despite joining later in a data stream. Note that
  this queued first timestep does count against the QueueLimit parameter
  above, so if a QueueLimit is specified, it should be a value larger
  -than 1. Further note while specifing this parameter guarantees that
  +than 1. Further note while specifying this parameter guarantees that
  the preserved first timestep will be made available to new readers,
  other reader-side operations (like requesting the LatestAvailable
  timestep in BeginStep) might still cause the timestep to be skipped.
  @@ -201,6 +209,7 @@ This value is interpreted by only by the SST Writer engine.
  RegistrationMethod string **File**, Screen
  QueueLimit integer **0** (no queue limits)
  QueueFullPolicy string **Block**, Discard
  + ReserveQueueLimit integer **0** (no queue limits)
  DataTransport string **default varies by platform**, RDMA, WAN
  ControlTransport string **TCP**, Scalable
  NetworkInterface string **NULL**
  