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import-checker: resolve relative imports

"from . import X" will produce an ImportFrom ast node with .module =
None. This resulted in a run-time error from attempting to concatenate
None with a str.

Another problem with relative imports is that the prefix may be dynamic
based on the "level" attribute of the import. e.g. "from ." has level 1
and "from .." has level 2.

We teach the "fromlocal" function how to cope with relative imports.
Where appropriate, the consumer passes in the level so relative module
names may be resolved properly.

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.