show: config option to register aliases for views As part of using `hg show` in my daily workflow, I've found it slightly annoying to have to type full view names, complete with a space. I've locally registered an alias for "swork = show work." I think others will have this same complaint and could benefit from some automation to streamline the creation of aliases. So, this commit introduces a config option that allows `hg show` views to be automatically aliased using a given prefix. e.g. a value of "s" will automatically register "swork" and "sbookmarks." Multiple values can be given for ultimate flexibility. This arguably isn't needed now. But since we don't register aliases if there will be a collision and we're bound to have a collision, it makes sense to allow multiple prefixes so specific views can avoid collisions by using different prefixes.

blackbox: use a human readable version of the default Now that the default value is also converted we can use a human readable version for it. This will be useful if we start to automatically display the default config value in various place.

configitems: register 'blackbox.maxsize' as an example of 'configbytes' This exercise the default value handling in 'configbytes'.

blackbox: minor code reordering The version declaration should come first in my opinion. This will help gather the command table with the config table.