Add lintian checks for package uploads

[Julian Edwards]

Full check using `lintian -ivI --pedantic *.changes`
It is very useful for increase packages quality.

[Tehnick (tehnick)]

I should explain my idea more detail to accelerate the progress.

There is no necessary in special web page or special area in existing one to
display lintian information. Build log is the best place for this stuff.

There is no necessary to make a lot of changes in Launchpad code. It will be
enought two things:
1) Option in PPA setting. (Disabled by default to not increase servers loading)
2) Just 1 or 2 strings in build script, for example:
if(isLintianCheckEnabled)
    lintian -ivI --pedantic *.changes

And build log will be look like this:
...
******************************************************************************
Built successfully
------------------------------------------------------------------------------
Lintian check is enabled
<lintian output>
------------------------------------------------------------------------------
Purging chroot-autobuild/build/buildd/<package>-<version>
------------------------------------------------------------------------------
...