python [Errno 24] Too many open files

Nach ein paar Tagen bringt meshkit öfters folgenden fehler.
(workaround ist das stoppen und -9-killen der python prozesse

```
DEBUG:__restricted__: result: null
Traceback (most recent call last):
File "/home/walter/meshkit/web2py/gluon/shell.py", line 271, in run
File "", line 1, in
File "/home/walter/meshkit/web2py/gluon/scheduler.py", line 730, in loop
File "/home/walter/meshkit/web2py/gluon/scheduler.py", line 354, in async
File "/usr/lib/python2.7/multiprocessing/__init__.py", line 218, in Queue
File "/usr/lib/python2.7/multiprocessing/queues.py", line 63, in init
File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 147, in init
File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 75, in init
OSError: [Errno 24] Too many open files

```