Remove DIY "migration" script

web/update_db.* scripts used several non-worging commands:

* `python manage.py reset` non-working since Django 1.5
* `python tupa/dia2django.py` script removed in b15a827
* `python legacy/RenameFixture.py` didn't do anything in current
  version.
* `python manage.py inspectlegacy` Broken in code formatting commit

inspectlegacy.py is originally vendored from Django's
inspectdb subcommand. It was altered to write changes
directly to legacy/models.py and to do it only for
models already specified in that same legacy/models.py.

Commit f316ada already changed
instructions so that those database updation scripts are not used.

In Django 1.7 there will be real migrations baked in to the framewrok.

web/manage.py

@@ -8,7 +8,6 @@
 
 try:
     import settings  #
-    import legacySettings  # Legacy settings for exporting an legacy db
 except ImportError:
     import sys
 
@@ -19,8 +18,4 @@
     sys.exit(1)
 
 if __name__ == "__main__":
-    set = settings
-    if len(sys.argv):
-        if sys.argv[1] == "dumpdata":
-            set = legacySettings
-    execute_manager(set)
+    execute_manager(settings)