[age restriction] progress 12/n

- taler-offline-tool now handles extensions
  - command "extensions" added with subcommands "show" and "sign"
  - parses extensions from taler config
  - shows and signs of extensions and their configurations
  - creates signed set of configurations for upload
  - added test for retrieval of extension config

- simplified signature verification for extensions
  - remove per-extension signatures, also from DB schema
  - adjust prepared statements accordingly
  - adjust DB event handler for extensions
  - allow NULL for config for extension in DB schema
  - handler for /management/extensions adjusted to new datastructures

- changed test for TALER_denom_blind/TALER_denom_sign_blinded with and
  without TALER_AgeHash

- minor updates and various fixes

1 files changed, 3 insertions, 1 deletions

diff --git a/src/exchange/taler-exchange-httpd.h b/src/exchange/taler-exchange-httpd.h
index 4f04029e6..39666379e 100644
--- a/src/exchange/taler-exchange-httpd.h
+++ b/src/exchange/taler-exchange-httpd.h
@@ -206,7 +206,9 @@ extern struct GNUNET_CURL_Context *TEH_curl_ctx;
  */
 extern struct TALER_Extension **TEH_extensions;
 
-#define TEH_extension_enabled(ext) (0 <= ext && TALER_Extension_Max > ext && \
+/* TODO: this will not work anymore, once we have plugable extensions */
+#define TEH_extension_enabled(ext) (0 <= ext && TALER_Extension_MaxPredefined > \
+                                    ext && \
                                     NULL != TEH_extensions[ext]->config)
 
 /**