Set revision number to 2.0.0.

README_FDB

+Since CDI version 2.0.0 access to FDB5 is supported.
+This support has the status experimental, because the error handling is still very limited.
+Furthermore, the user interface currently allows only limited access to the FDB.
+For FDB access a fdb5 and ecCodes library is required.
+FDB5 support is enabled with the configure option:
+
+     --with-fdb5=<fdb5 root directory>
+

configure.ac

@@ -7,7 +7,7 @@
 AC_PREREQ([2.69])
 LT_PREREQ([2.4.6])
 
-AC_INIT([cdi],[2.0.0rc5],[https://mpimet.mpg.de/cdi])
+AC_INIT([cdi],[2.0.0],[https://mpimet.mpg.de/cdi])
 
 AC_DEFINE_UNQUOTED(CDI, ["$PACKAGE_VERSION"], [CDI version])