Minor rename: FIND -> SEARCH
Moved code
Define FIND for lists
Re-implement MACROLET and SYMBOL-MACROLET as macros
Update TODO
Add environments, support for nested MACROLET/SYMBOL-MACROLET
Initial implementation of LET
Moved code
Moved code
Moved code; minor tweak
Moved code
Initial version of embedded macros in the output for the compiler
Define CAT!
Get rid of boot.x