mercurial/templates/raw/filediff.tmpl

import-checker: add utility to examine what module is imported easily

`fromlocalfunc()` uses:

  - `modulename` (of the target source) to compose absolute module
    name imported relatively from it

    It is assumed that `modulename` is an `dotted_name_of_path()`-ed
    source file, which may have `.__init__` at the end of it.

    This assumption makes composing `prefix` of relative name easy.

  - `localmods` to examine whether there is a locally defined (=
    Mercurial specific) module matching against the specified name

    It is assumed that module names not existing in `localmods` are
    ones of Python standard library.

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