add scratch
don't initialize history (it seems not to be necessary, though I'm not confident
implement useful procedures
add tests
cosmetic changes
Merge branch 'master' into editline
comment out `read-history` test
implement history manipurating procedures
add test and description comment
add history-expand and its test cases
separate example from test
more detail error message on car/cdr error
generate better load error message
Merge pull request #192 from KeenS/better-load-error-message

generate better load error message
remove redundant code
find exactly required header file
add in-library
cosmetic changes
add reader struct
Find readline.h in both editline/ and edit/readline/