[wp/doc] update changelog & manual

src/plugins/wp/Changelog

@@ -20,11 +20,15 @@
 #   <Prover>: prover
 ###############################################################################
 
-- WP	      [2019/09/12] New cache mechanism for why3 provers, see -wp-cache option
+- TIP         [2019/09/17] Using all selected Why-3 provers for proof search
+- Gui         [2019/09/17] Updated panel for provers, models, cache, etc.
+- WP          [2019/09/12] New cache mechanism for why3 provers, see -wp-cache option
+-! WP         [2019/09/17] Deprecated native alt-ergo & coq output, see -wp-prover option
+-! WP         [2019/07/05] -wp-prover <p> now defaults to <why3:p> (including default alt-ergo)
+-! WP         [2019/07/05] Use native Why3 API (now requires why3 at compile time)
 - WP          [2019/06/27] Improving Cint simplifier and quantifier introduction
-o WP          [2019/06/27] Using the new API of Qed
-o Qed         [2019/06/27] Changes into the API in order to get a more secure way to manipulate quantifiers and binding
-- Qed         [2019/05/09] Transforms some boolean quantifications into let constructs
+o Qed         [2019/06/27] More secure API for quantifier management
+- Qed         [2019/05/09] Transform (some) boolean quantifications into variable assignments
 
 ##########################
 Plugin WP 19.0 (Potassium)

src/plugins/wp/doc/manual/wp_plugin.tex

@@ -1380,8 +1380,8 @@ The cache can only be used with \textsf{Why-3} provers, it does not work with na
 The main option to control cache usage is \verb+-wp-cache+, documented below:
 
 \begin{description}
-\item[\tt -wp-cache <mode>] selects the cache mode to use with why3 provers. The default mode is \verb'update' if \verb+-wp-session+ is set, and \verb+none+ otherwize. The cache entries
-are stored in the session directory, which would be \verb+./frama-c/wp/cache+ by default.
+\item[\tt -wp-cache <mode>] selects the cache mode to use with why3 provers. The default mode is \verb'update' if \verb+-wp-session+ is set or when using the Frama-C/Gui, and \verb+none+ otherwize. The cache entries
+are stored in the session directory, which is \verb+./frama-c/wp/cache+ by default.
 \end{description}
 
 The available cache modes are described below: