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errors: let each Abort subclass define its error code

Authored by martinvonz.

Description

errors: let each Abort subclass define its error code

It's more flexible to have the error codes defined on the error types
themselves. That way extensions can easily set their own exit code. It
also means that we can reduce a bit of duplication betwen
scmutil.callcatch() and chgserver.chgcmdserver.validate().

Differential Revision: https://phab.mercurial-scm.org/D10735

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