Added new return codes to RsInit::InitRetroShare to know, what failed.

Show error box when gpg initialization failed.

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@3744 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/pqi/authgpg.cc

@@ -135,6 +135,8 @@ AuthGPGimpl::AuthGPGimpl()
         {
             RsStackMutex stack(gpgMtxEngine); /******* LOCKED ******/
 
+            CTX = NULL;
+
             setlocale(LC_ALL, "");
             gpgme_check_version(NULL);
             gpgme_set_locale(NULL, LC_CTYPE, setlocale (LC_CTYPE, NULL));
@@ -197,6 +199,11 @@ bool AuthGPGimpl::InitAuth ()
 {
     std::string HomeDir;
 
+    if (!CTX) {
+        std::cerr << "Error with gpg initialization. Is gpg missing ?" << std::endl;
+        return false;
+    }
+
 #ifdef WINDOWS_SYS
     if (RsInit::isPortable ()) {
         // set home dir of gpg to configdir\gnupg