update ui.quiet/verbose/debug/interactive every time the config changes
- ui.quiet/verbose/debug/interactive become just a cache of the ui.cdata
settings
- the quiet, verbose, debug and interactive options from the [ui] section
from .hg/hgrc files are respected for commands that open the repo
- setting ui.quiet/verbose/debug/interactive with --config works
- the command line options always override the hgrc settings - previously
it wasn't possible to override a [ui] debug = True. --debug still
takes precedence over --quiet and --verbose.