configitems: register 'ui.clonebundleprefers' as example for 'configlist' This exercise the default value handling in 'configlist'.

configitems: register 'patch.fuzz' as first example for 'configint' This exercise the default value handling in 'configint'.

configitems: issue a devel warning when overriding default config If the option is registered, there is already a default value available and passing a new one is at best redundant. So we issue a deprecation warning in this case. (note: there will be case were the default value will not be as simple as what is currently possible. We'll upgrade the configitems code to handle them in time.)

eol: fix 'error' parameter name in the commitctx wrapper Since its introduction in 9dfee83c93c8, the parameter has always been name "error". Yet the eol extension have been using 'haserror' as the argument name, breaking extensions with subclass passing 'error' as a keyword argument.

eol: import 'error' as 'errormod' We need the 'error' name available to fix another bug, so we rename the imported module.

configitems: register 'ui.quiet' as first example We now have a user and this works fine.

configitems: get default values from the central registry when available We do not have any registered config yet, but we are now ready to use them. For now we ignore this feature for config access with "alternates". On the long run, we expect alternates to be handled as "aliases" by the config item themself.

configitems: introduce a central registry for config option We now have the appropriate infrastructure to register config items. Usage will added in the next changeset.