this also fix bad display of all changelog in verbose mode

we now have a changelog command, no needs to overload list output

we can now set a minimal installsystems version in your description
install will not be able to read those images

Add tarfile from python 2.7.2

This allow method add in Tarfile to have filter parameter.
This give us filter capa on file to include.
Should be removed when python 2.7 will be the minimum version

Because we roolback to python 2.6 requirment, we need to ship.

as a corolary, invalid option are no more loaded

This allow displaying to be done without coloration

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

is new have now an force option to overwrite existing images

This allow and easy double extracting without needs to delete it before

is new try to instanciate the new created object. But it doesn't pass validation...

tarfile module fail to extract tarball with utf8 filenames when destination is an unicode
string. We need to convert dest as utf-8 string to restore an expected behaviour

=> Image debian-generic v4 loaded
Error: 'ascii' codec can't encode character u'\xe9' in position 27: ordinal not in range(128)
Traceback (most recent call last):
  File "/usr/bin/is", line 482, in <module>
    error(e)
  File "/usr/bin/is", line 480, in <module>
    args.func(p_main, args)
  File "/usr/bin/is", line 242, in c_list
    img, repo = select_image(o, repoman, args.best)
  File "/usr/bin/is", line 64, in select_image
    return repoman.get(image, version, best)
  File "/usr/lib/python2.6/dist-packages/installsystems/repository.py", line 616, in get
    return repo.get(name, version), repo
  File "/usr/lib/python2.6/dist-packages/installsystems/repository.py", line 399, in get
    pkg = PackageImage(path, fileobj=memfile, md5name=True)
  File "/usr/lib/python2.6/dist-packages/installsystems/image.py", line 458, in __init__
    arrow("Author: %s" % self.author, 1)
  File "/usr/lib/python2.6/dist-packages/installsystems/printer.py", line 107, in arrow
    out(" #light##yellow#=>#reset# %s" % message)
  File "/usr/lib/python2.6/dist-packages/installsystems/printer.py", line 55, in out
    fd.write("%s%s" % (message, endl))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 27: ordinal not in range(128)

We need installsystems is functional on squeeze systems...

So we needs to embed:
- argparse 2.7.1 (not in python2.6)
- progressbar 2.3 (not in debian squeeze)

We can now use installsystems without paramiko

Add a changelog file inside isimage with a custom format which allow
image creator to quickly show update between images

Add a isversion field inside isimage which tell which version of installsystems was used to build image

Also fix some bug in PipeFile

This commit introduce remote repository and file accross ssh

currently db badly create if directory already exists before creation

We now use PipeFile to handle complex file type and compute md5 and filesize.

This commit add the following features in installsystems:
- A download progress bad
- check size before download
- check size after download
- check md5 after download