Update sets

sets/development.conf

@@ -20,6 +20,8 @@
 * dev-util/splint
 * app-doc/doxygen
 * media-gfx/graphviz
+* dev-util/astyle
+* dev-util/valgrind
 
 # GTK
 * dev-util/glade
@@ -54,7 +56,8 @@
 * fonts/FiraCode
 
 # rust
-* dev-lang/rust
+* dev-lang/rust:stable
+* dev-lang/rust:nightly
 
 # scala
 * dev-lang/scala-bin
@@ -80,3 +83,23 @@
 # fstar
 * dev-lang/fstar
 * dev-lang/fsharp
+
+# python
+* dev-lang/python:2.7
+* dev-lang/python:3.6
+* dev-lang/python
+* dev-lang/coconut
+* dev-python/mypy
+
+# databases
+* dev-db/mysql-workbench
+* dev-db/mysql
+* dev-db/pgmodeler
+* dev-db/postgresql
+
+# clojure
+* dev-lang/clojure
+
+# others
+* dev-lang/elixir
+* dev-lang/openjdk8