debdelta-upgrade can be used to upgrade whole system, while saving time and bandwidth.The debdelta-upgrade man page says,

debdelta-upgrade  -  Downloads  all deltas that may be used to 'apt-get
upgrade', and apply them.


But can I use debdelta or debdelta-upgrade to install/update single package?


Question: Equitably distributed curve on a sphere
Answer: to me the best possible solution seems to be the sequence of closed Hilbert curves on the Cubed Sphere;
that curve consists of six ordinary Hilbert Curves, one for each face of a cube, which, when appropriately connected, yield a space-filling Jordan Curve for the cube's surface.
Then centrally projecting those curves onto a cocentric sphere yields a solution without crowding, albeit a slightly higher density around the projections of the cube's corners.

A further improvement may result from rounding away the corners in a similar fashion as is used for tennis balls, which is the rounding applied to your example.  

Yet another, maybe even better, bet would be Hamilton Cycles of Hamiltonian Fullerene Graphs (cf e.g. http://arxiv.org/pdf/0801.3854.pdf for a discussion); that bet is based on the honeycomb conjecture (cf e.g. http://en.wikipedia.org/wiki/Honeycomb_conjecture) and on the fact, that Fullerene graphs are the closest one can get to a hexagonal tiling of the sphere (there are twelve inevitable pentagons).
Examples of Hamiltonian Fullerene graphs are depicted here: http://www.academia.edu/4269519/On_the_Hamiltonicity_of_Fullerenes.