Set up a simple cartoon problem of matter falling onto a field loop

The goal is to see whether the problem could be used to study pulsar
accretion, as per a conversation with Alice Harding.
Add a visual module and a line integral convolution plot
Improve LIC function and pulsar problem
Add a timer to simulation base
Bix build bug on older Mac's: add ranlib call for .a files
Fix a bug in the ASCII output functions
Merge branch 'master' of git://github.com/jzrake/ctf