Verbose setting overwrite custom logger level.

[Carreau]

Transcations also have a verbose attribute which is unused.

def install(..., verbose=<value default False>) overwrite a custom logger level. This and a few other places should allow None meaning "don't change the level".

[Carreau]

(in my case it is overwritting to a lower level as I start my session with a getLogger('micropip').setLevel(DEBUG).

[ryanking13]

Thanks, that sounds reasonable to me.

I wonder if it would be better to remove the verbose parameter at all, and let users externally set getLogger('micropip').setLevel() to chang the log level. I introduced the verbose parameter to help users see what micropip does internally, but probably it is a bad practice logging-wise.

[Carreau]

Should have been fixed by #132