Move pkgsets folder into project root to conform with option naming.

Add simple package filter to auto remove broken packages.

fn.nix

@@ -17,4 +17,17 @@ rec {
   lsf = p: (lst { p = p; });
   lsd = p: (lst { p = p; t = "directory"; b = true; });
   lsfRec = p: b: flatten ((map (np: lsfRec np b) (lsd p)) ++ (lst { p = p; b = b; }));
+  hasAttrs = aList: d: (map
+    (a:
+      (ifelse (isList a)
+        (hasAttrByPath a d)
+        (hasAttr a d)))
+    aList);
+  pkgFilter = l: (filter
+    (p: (
+      ifelse (elem true (hasAttrs [["meta" "broken"]] p))
+        (warn "Package ${p.name} is marked as broken." false)
+        true)
+    )
+    l);
 }