JJ: Description from the destination commit:

add parse_config.ml (buggy)

JJ: Description from source commit:
remake config parser

include/dune

@@ -9,6 +9,11 @@
  (modules gen_taler_signatures)
  (libraries fmt angstrom))
 
+(executable
+ (name parse_config)
+ (modules parse_config)
+ (libraries fmt angstrom amount))
+
 ; we prefer to generate taler_signatures.ml once,
 ; and commit it, for versionning:
 ;