keepassxc: rename from keepassx-community

I think the new name is more appropriate, see https://keepassxc.org/.

pkgs/applications/misc/keepassx/community.nix

@@ -6,7 +6,7 @@
 with stdenv.lib;
 
 stdenv.mkDerivation rec {
-  name = "keepassx-community-${version}";
+  name = "keepassxc-${version}";
   version = "2.2.2";
 
   src = fetchFromGitHub {

pkgs/top-level/aliases.nix

@@ -83,6 +83,7 @@ mapAliases (rec {
   kdiff3-qt5 = kdiff3; # added 2017-02-18
   keepassx2-http = keepassx-reboot; # added 2016-10-17
   keepassx-reboot = keepassx-community; # added 2017-02-01
+  keepassx-community = keepassxc; # added 2017-11
   keybase-go = keybase;  # added 2016-08-24
   krename-qt5 = krename; # added 2017-02-18
   letsencrypt = certbot; # added 2016-05-16

pkgs/top-level/all-packages.nix

@@ -14497,7 +14497,7 @@ with pkgs;
 
   keepassx = callPackage ../applications/misc/keepassx { };
   keepassx2 = callPackage ../applications/misc/keepassx/2.0.nix { };
-  keepassx-community = libsForQt5.callPackage ../applications/misc/keepassx/community.nix { };
+  keepassxc = libsForQt5.callPackage ../applications/misc/keepassx/community.nix { };
 
   inherit (gnome3) evince;
   evolution_data_server = gnome3.evolution_data_server;