fixup/move let()
Large step in cleaning up import

 * It is now possible to do: import foo bar boo

 * Some heavy lifting changes, not entirely stablized yet
Add new cmdline option

 * Added -I, --import to allow for manually performing an import before
   processing the rest of the cmdline.  This is necessary to allow
   things like: shlib --import math -c 'math.seq 12'
Always write aliases to allow alias chaining
We always have dirname(), so use it.
Make everything work with new shlib changes
Add in math.seq()