2014-09-02: update version to 0.6.2

update version to 0.6.2

diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 dnl run `autoreconf -i` to generate a configure script. 
 dnl Then run ./configure to generate a Makefile.
 dnl Finally run make to generate the project.
-AC_INIT([wisp], [0.6.1],
+AC_INIT([wisp], [0.6.2],
         [arne_bab@web.de])
 # Check for programs I need for my build
 AC_CANONICAL_TARGET