Adding package-author.
Installing builtin package versions.
Tidying up environment monad docs.
Better (chibi show) documentation.
Linking to (chibi show) docs.
Fixing ffi docs extraction.
Fixing a long-standing typo in lset<=.
Fixes issue #224.
Fixing potential stack corruption in n-ary numeric inequalities.
Supporting selecting from multiple package choices.
Supporting gauche install path.