[age restriction] progress 10/n

More work towards support for extensions:
- Prepared statements and DB-plugin-functions for setting and retrieving
  configurations from the database added.
- primitive "registry" of extensions for age restrictions and peer2peer
  (stub)
- TALER_Extensions now with FP for parsing, setting and converting a
  configuration.
- /management/extensions handler now verifies signature of the (opaque)
  json object for all extensions.
- /management/extensions handler calls the FP in the corrensponding
  TALER_Extension for parsing and setting the configuration of a
  particular extension

More work towards age restriction:
- TALER_Extensions interfaces for config-parser, -setter and converter
  implemented for age restriction
- DB event handler now retrieves config from database, parses it and
  sets it (the age mask) in the global extension.
- load_age_mask now loads age mask from the global extension (and not
  from the config file)
- add age_restricted_denoms to /keys response

1 files changed, 1 insertions, 0 deletions

diff --git a/src/util/Makefile.am b/src/util/Makefile.am
index cae1a205e..55ebb4dff 100644
--- a/src/util/Makefile.am
+++ b/src/util/Makefile.am
@@ -72,6 +72,7 @@ libtalerutil_la_SOURCES = \
   crypto_wire.c \
   denom.c \
   exchange_signatures.c \
+  extensions.c \
   extension_age_restriction.c \
   getopt.c \
   lang.c \