Abandon getting changeset revision number from svn keyword expansion

Subversion keyword expansion of $Rev:$ in  a file is hopeless as it is
impossible to  coordinate with  a release. Revert  to an  empty string
when it can't be discovered with svn info etc..

Further changes to the way verion and revision numbers are generated

Local builds from  source tar balls or the  two phase wsjtx-superbuild
no longer specify  any revision, just the version  number. Since these
sort  of builds  are  expected  to be  release  candidates or  release
versions the revision (svn changeset  number) is implicit from the svn
tag of the version.

Merged from wsjtx-1.4 branch.



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@4986 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

main.cpp

@@ -44,13 +44,7 @@ int main(int argc, char *argv[])
 	      
       // Override programs executable basename as application name.
       a.setApplicationName ("WSJT-X");
-#if CMAKE_BUILD
-      a.setApplicationVersion (WSJTX_STRINGIZE (WSJTX_VERSION_MAJOR)
-                               "." WSJTX_STRINGIZE (WSJTX_VERSION_MINOR)
-                               "." WSJTX_STRINGIZE (WSJTX_VERSION_PATCH) " " + revision ());
-#else
-      a.setApplicationVersion ("Not for Release");
-#endif
+      a.setApplicationVersion (version ());
 
       bool multiple {false};