Move the modules out of the src/ directory.
Stop include prelude.H.
Update note.
Assert that we aren't trying to load or preprocess a variable with no body.
Parse builtins correctly.
Locate, and link to, libdl.
Add todo note.
Add some infrastructure for loading modules.
Rename prelude.{H,C} to loader.{H,C}
Build and install mod.so
Fix loading of symbols from builtins.
Move function 'log' over to the plugin framework.
Remove defunct comment.