import-checker.py: exit with code 0 if no error is detected
Before this patch, `import-checker.py` exits with non-0 code, if no
error is detected. This is unusual as Unix command.
This change may be a one of preparations for
issue4677, because this
can avoid extra explanation about unusual exit code of
`import-checker.py` for third party tool developers.
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.