fix plugins install : clean old plugins

Makefile.in

@@ -366,6 +366,7 @@ clean::
 	rm -f lib/plugins/*
 
 install_no_local::
+	rm -rf $(LIBDIR)/why3/plugins
 	mkdir -p $(LIBDIR)/why3/plugins
 	cp -f $(foreach f,$(LIBPLUGCMO) $(LIBPLUGCMXS),$(wildcard $(f))) $(LIBDIR)/why3/plugins
 

ROADMAP

@@ -137,6 +137,7 @@ New features:
   o dropped support for Coq 8.2
   o new scheme for Coq realizations using type classes
   o Support for PVS 6.0, including realizations
+  o support for iProver and Zenon
   o a warning is emitted for unused bound logic variables in
     "forall", "exists" and "let"
 

plugins/tptp/tptp_lexer.mll

@@ -246,7 +246,7 @@ and comment_line = parse
       { comment_line lexbuf }
 
 {
-(* dead code
+
   let with_location f lb =
     if Debug.test_flag Debug.stack_trace then f lb else
     try f lb with
@@ -259,9 +259,9 @@ and comment_line = parse
     let ast = with_location (tptp_file token) lb in
     (), Tptp_typing.typecheck env path ast
 
-  let library_of_env = Env.register_format "tptp" ["p";"ax"] read_channel
+  let _library_of_env = Env.register_format "tptp" ["p";"ax"] read_channel
     ~desc:"TPTP format (CNF FOF FOFX TFF)"
-*)
+
 }
 
 (*