enable message control option cannot be repeated in the rcfile

[pylint-bot]

Originally reported by: Laurent Raufaste (BitBucket: nalog, GitHub: @Nalog?)

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I'm using pylint 1.4.1.

With this rcfile, E108 get detected:

#!ini
[MESSAGES CONTROL]
disable = all
enable = E0103,E0108,E0601

With this rcfile, E108 don't get detected:

#!ini
[MESSAGES CONTROL]
disable = all
enable = E0103
enable = E0108
enable = E0601

This is contrary to what the doc states:
You can either give multiple identifier separated by comma (,) or put this option multiple time.
Source: http://docs.pylint.org/features.html#pylint-global-options-and-switches

The doc about disable is more explicit:
_You can either give multiple identifiers separated by comma (,) or put this option multiple times (only on the command line, _not in the configuration file where it should appear only once).**

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• Bitbucket: https://bitbucket.org/logilab/pylint/issue/486

[lra]

Github: @lra