Added copyright.
Removed earmuffs from variables *LINES* and *ALL-LINES*.

These two variables in the function SETUP-MARKED-EXTENTS were nowhere
declared special, and the SBCL compiler emitted a warning that the
lexical binding was used despite the earmuffs.  There is no trace of
*LINES* and *ALL-LINES* in any other file, nor in any other function.
I removed the earmuffs to avoid the warning.
Added copyright