[opam] update description format according to opam preferences

Makefile

@@ -311,7 +311,7 @@ DISTRIB_FILES:=\
       bin/sed_get_make_major bin/sed_get_make_minor                     \
       INSTALL.md README.md .make-clean	                        \
       .make-clean-stamp .force-reconfigure 	\
-      opam/opam opam/descr \
+      opam/opam \
 
 # Test files to be included in the distribution (without header checking).
 # Plug-ins should use PLUGIN_DISTRIB_TESTS to export their test files. 

headers/header_spec.txt

@@ -106,7 +106,6 @@ licenses/LGPLv2: .ignore
 licenses/LGPLv2.1: .ignore
 licenses/Q_MODIFIED_LICENSE: .ignore
 man/frama-c.1: CEA_LGPL
-opam/descr: .ignore
 opam/opam: .ignore
 ptests/.gitignore: .ignore
 ptests/.merlin: .ignore

opam/descr

-Platform dedicated to the analysis of source code written in C.
-
-Frama-C gathers several analysis techniques in a single collaborative
-framework, based on analyzers (called "plug-ins") that can build upon the
-results computed by other analyzers in the framework.
-Thanks to this approach, Frama-C provides sophisticated tools, including:
-- an analyzer based on abstract interpretation (Eva plug-in);
-- a program proof framework based on weakest precondition calculus (WP plug-in);
-- a program slicer (Slicing plug-in);
-- a tool for verification of temporal (LTL) properties (Aoraï plug-in);
-- a runtime verification tool (E-ACSL plug-in);
-- several tools for code base exploration and dependency analysis
-  (plug-ins From, Impact, Metrics, Occurrence, Scope, etc.).
-These plug-ins communicate between each other via the Frama-C API
-and via ACSL (ANSI/ISO C Specification Language) properties.

opam/opam

 opam-version: "2.0"
 name: "frama-c"
 synopsis: "Platform dedicated to the analysis of source code written in C"
+description:"""
+Frama-C gathers several analysis techniques in a single collaborative
+framework, based on analyzers (called "plug-ins") that can build upon the
+results computed by other analyzers in the framework.
+Thanks to this approach, Frama-C provides sophisticated tools, including:
+- an analyzer based on abstract interpretation (Eva plug-in);
+- a program proof framework based on weakest precondition calculus (WP plug-in);
+- a program slicer (Slicing plug-in);
+- a tool for verification of temporal (LTL) properties (Aoraï plug-in);
+- a runtime verification tool (E-ACSL plug-in);
+- several tools for code base exploration and dependency analysis
+  (plug-ins From, Impact, Metrics, Occurrence, Scope, etc.).
+These plug-ins communicate between each other via the Frama-C API
+and via ACSL (ANSI/ISO C Specification Language) properties.
+"""
 version: "21.0-beta"
 maintainer: "francois.bobot@cea.fr"
 authors: [

opam/url

-http: "http://frama-c.com/download/frama-c-Chlorine-20180501.tar.gz"
-checksum: "2d61aa200ded2dd360a8310c9a03ac50"