config: add initial implementation of --edit This launches the preferred editor on either: a) the first non-empty user rc file found b) the first user rc file in the search list

revert: extract actual revert in its own function With this small refactoring, the computation of the action to perform and the actual change to the disk happen in different function. This allows extension to wrap the later in case of need. The initial motivation is the `remotefilelog` extension that need to prefetch all the file content to be checked out.

config: move showconfig code and add config as primary alias Preparation for adding config --edit to launch an editor

revset: added _hexlist method to replace _list for %ln Now %ln expression goes through _hexlist and doesn't do any unnecesary processing anymore.

merge with stable

localrepo: language and spelling fixes in comment

revset: added _intlist method to replace _list for %ld Now %ld expression goes through _intlist and doesn't do any unnecesary processing anymore.

purge: avoid duplicate output for --print (issue4092) Now "hg purge -p" commands avoids printiing duplication of filenames. Second patch is the test coverage of first patch which tells that '-p' does not depend on whether ui.verbose is configured or not,that means it is independent of '-v'.

merge with stable

merge with stable