Need more space for CASApy PPA

Hi

We are maintaining an upstream open source python "source tree"
from http://www.atnf.csiro.au/computing/software/casapy/
in order to have easy installation and automatic updates
of this radio astronomy data analysis software.

The package increased in size from 400M in version 3.4 to
over 700M in version 4.0, and the PPA is now overfull at
https://launchpad.net/~aims/+archive/casapy/+packages
See sizes at https://svn.cv.nrao.edu/casa/linux_distro/stable/

In addition, some radio astronomers have asked me to maintain
both series 3.4 and series 4.0, as there are still bugs in series 4.0
but much new functionality. If this is possible, the two packages
together should fit into 8G.

Can the size be increased from 4G to 8G?

Regards,
Jan Groenewald
IT Manager
African Institute for Mathematical Sciences