Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Before this, timeout only apply to repository caching.

Now timeout is used by all transfert functions.
A new parameter repo_timeout is available to set a custom timeout on repository

In case of bad download, error given by is feeder is better than output
of compressor which claims data are missing

E: python-installsystems: depends-on-essential-package-without-using-version depends: gzip
E: python-installsystems: depends-on-essential-package-without-using-version depends: tar
N:
N:    The package declares a depends on an essential package, e.g. dpkg,
N:    without using a versioned depends. Packages do not need to depend on
N:    essential packages; essential means that they will always be present.
N:    The only reason to list an explicit dependency on an essential package
N:    is if you need a particular version of that package, in which case the
N:    version should be given in the dependency.
N:
N:    Refer to Debian Policy Manual section 3.5 (Dependencies) for details.
N:
N:    Severity: important, Certainty: certain
N:

E: installsystems source: missing-python-build-dependency
N:
N:    The package appears to use Python as part of its build process in
N:    debian/rules but doesn't depend on Python.
N:
N:    Normally, packages that use Python as part of the build process should
N:    build-depend on one of python, python-all, python-dev, or python-all-dev
N:    depending on whether they support multiple versions of Python and
N:    whether they're building modules or only using Python as part of the
N:    package build process. Packages that depend on a specific version of
N:    Python may build-depend on the appropriate pythonX.Y or pythonX.Y-dev
N:    package instead.
N:
N:    Refer to Debian Policy Manual section 4.2 (Package relationships) for
N:    details.
N:
N:    Severity: important, Certainty: certain
N:

We now use system tar and gzip to compress/decompress payloads

Goals are:
- Speed-up extraction and creation of payloads.
- Allow to use non-python supported compressor like (pbzip2 and xz)
- Remove python2.7.1 tarfile.py module
- Remove python 2.7.1 gzip.py to avoid filename to be in gzip headers
- Remove gzipstream.py module used to stream gzip file

command extract use only one image at a time

min and max is no more handled by select_images

this allow to run parser script without running setup script
useful to valid arguments without causing trouble

this options are also settable by config
allow to have installsystems niced before launch action

python-psutil minimun version is 0.2.1 to support set_ionice

move command now ask for a global move and check if source repository are local

All command now use select_image in repoman to select which image should be
select for use

search is now added to repoman and not by command

best option was dropped for all command

changelog command take now more than one image
diff command is no more limited to 2 args. Can be one with globbing
list -a is dropped, use *:* instead (this can be used in all command)

is command allow smart image selection like this:

- ftp/* => list all image in repo ftp
- ftp/*:4 => list all image in version 4 in repo ftp
- *:4 => list all images at version 4 in search path
- */*:4 => list all images at version in all repo
- debian => list all images nammed debian in search path
- debian* => list all images starting by debian in search path

execute clean command without asking confirmation