Bindings of setLoggerVerbosityLevel

[jmirabel]

The following code snippets

from dynamic_graph.tracer import Tracer
t = Tracer('t')
t.setLoggerVerbosityLevel(0)

gives

SystemError                               Traceback (most recent call last)
SystemError: ../Objects/longobject.c:244: bad argument to internal function

[jmirabel]

However,

from dynamic_graph.tracer import Tracer
from dynamic_graph.entity import VerbosityLevel
t = Tracer('t')
t.setLoggerVerbosityLevel(VerbosityLevel.VERBOSITY_ALL)

works.
I will update the doc.

[jmirabel]

After double thinking about it, the error message is very misleading so I re-open this.