add file that tracks known bugs; update todo list

Author: striezel

engine/known_bugs.txt

@@ -0,0 +1,16 @@
+Known bugs:
+===========
+
+This file lists random things that are still buggy and do not work as expected
+or are somehow incomplete. The list itself is very likely to be incomplete as
+well.
+
+
+General:
+--------
+  * The game is still missing some major features (see todo.txt).
+
+
+Units:
+------
+  * Pioneers bought in European ports do not have any tools.

engine/todo.txt

@@ -3,7 +3,7 @@ To do:
 
 (This file lists some random things that still need to be done to improve and/or
  complete the game. You can possibly consider this as a list of missing features
- and known bugs.
+ and/or known bugs, although the later are documented in known_bugs.txt.
  The list itself is highly incomplete(!) and issues are listed in no particular
  order.)
 
@@ -18,6 +18,12 @@ Trade:
   *     "          "      "    "    "   other Europeans in new world
   * implement trading routes
 
+Colonies:
+---------
+  * notify player, if a new building was constructed in one of the colonies
+  * notify player, of a produced good cannot be stored due to not having enough
+    room in the warehouse
+
 GUI:
 ----
   * better layered graphics (i.e. make some real use of depth buffer)