duply: upgrade 1.6.0 -> 1.7.3

Changes since 1.6.0:

1.7.3 (3.4.2014)
- bugfix: test routines, gpg2 asked for passphrase although GPG_PW was set

1.7.2 (1.4.2014 "April,April")
- bugfix: debian Bug#743190 "duply no longer allows restoration without
   gpg passphrase in conf file"
   GPG_AGENT_INFO env var is now needed to trigger --use-agent
- bugfix: gpg keyenc test routines didn't work if GPG_PW was not set

1.7.1 (30.3.2014)
- bugfix: purge-* commands renamed to purgeFull, purgeIncr due to
   incompatibility with new minus batch separator

1.7.0 (20.3.2014)
- disabled gpg key id plausibility check, too many valid possibilities
- featreq 7 "Halt if precondition fails":
   added and(+), or(-) batch command(separator) support
- featreq 26 "pre/post script with shebang line":
   if a script is flagged executable it's executed in a subshell
   now as opposed to sourced to bash, which is the default
- bugfix: do not check if dpbx, swift credentials are set anymore
- bugfix: properly escape profile name, archdir if used as arguments
- add DUPL_PRECMD conf setting for use with e.g. trickle

pkgs/tools/backup/duply/default.nix

@@ -3,11 +3,11 @@
 }:
 
 stdenv.mkDerivation {
-  name = "duply-1.6.0";
+  name = "duply-1.7.3";
 
   src = fetchurl {
-    url = "mirror://sourceforge/project/ftplicity/duply%20%28simple%20duplicity%29/1.6.x/duply_1.6.0.tgz";
-    sha256 = "1i1yy4z6fcf3lq2k72cqcyqspm7pa1m949f8l9yscjm47bwp5g8f";
+    url = "mirror://sourceforge/project/ftplicity/duply%20%28simple%20duplicity%29/1.7.x/duply_1.7.3.tgz";
+    sha256 = "1lq5gwz69l8g4ki4anvmjdngbs9nin124j1zb9kbcnqj0s5jkbp0";
   };
 
   buildInputs = [ txt2man makeWrapper ];