[sugar] sugar-jhbuild changes

[Marco Pesenti Gritti]

Hello

I merged some major changes to sugar-jhbuild. Now it goes like this:

sugar-jhbuild sanitycheck

* Solve the external dependencies issues (if any) by installing the
required packages from your distribution.
* Solve base dependencies issues. If you are using a distribution which
defaults to python 2.5 then you might get away by just installing some
packages. Otherwise as explained by sanitycheck you can do
"sugar-jhbuild build meta-sugar-base" to build those.

sugar-jhbuild build

* Report any error you get. We need to improve sanitycheck to detect all
possible depencies issues.

sugar-jhbuild run

* Report any error you get. We need to improve sanitycheck to detect
issues.

Marco