Added "geom_point_dist_to_line"
First stab at a helix test.
Made simple helix create/destroy.
Added helix plotting functions.
Started writing "composite" test.
Started fiddling around with compoiste shapes.
Merged line.[ch] with line_test.[ch] for simplicity.
Merged circle/ellipse into ellipse.[ch].
Added _RESET() to Paleo test macros.
Updated ellipse macro names.
Combined arc into one c/h pair.
Renamed paleo threshs to have "PAL"
typo
Combined curve-related functionality.
Combined helix.
Combined helix into single c/h pair.
Finished unif, ready for merge.

The purpose of the unif branch was to unify the names of all Paleo-specific
functions and types.  That task is now complete, so this branch is ready to
be merged into master.