Fix log level parameter not taken into account in cwsource log table
An error in the jquery selector of the html widget controlling the log
level was the cause of this bug.
Closes #15772634
[config] Ignore cubicweb-pyramid in available_cubes()
So that, in particular, its ccplugin.py does not get loaded (which would hide
the "pyramid" command in cubicweb).
Related to #14023058.