* getkey.c (merge_selfsigs_main): Make sure the revocation key list starts

clean as this function may be called more than once (e.g. from functions
in --edit).

* g10.c, encode.c (encode_crypt), sign.c (sign_file,
sign_symencrypt_file): Make --compress-algo work like the documentation
says.  It should be like --cipher-algo and --digest-algo in that it can
override the preferences calculation and impose the setting the user
wants.  No --compress-algo setting allows the usual preferences
calculation to take place.

* main.h, compress.c (compress_filter): use new DEFAULT_COMPRESS_ALGO
define, and add a sanity check for compress algo value.

g10/main.h

@@ -25,10 +25,10 @@
 #include "cipher.h"
 #include "keydb.h"
 
-#define DEFAULT_CIPHER_ALGO  CIPHER_ALGO_CAST5
-#define DEFAULT_PUBKEY_ALGO  PUBKEY_ALGO_ELGAMAL
-#define DEFAULT_DIGEST_ALGO  DIGEST_ALGO_SHA1
-
+#define DEFAULT_CIPHER_ALGO   CIPHER_ALGO_CAST5
+#define DEFAULT_PUBKEY_ALGO   PUBKEY_ALGO_ELGAMAL
+#define DEFAULT_DIGEST_ALGO   DIGEST_ALGO_SHA1
+#define DEFAULT_COMPRESS_ALGO 1
 
 typedef struct {
     int header_okay;