initial commit (current version from LfBS home directory)
improve history

if command is empty "select" (i.e. 'repeat last select'),
put the last complete select statement into the history, so that it
can easily be edited in the next step
fix: mask '(' and ')' for egrep

for a following egrep, '(' and ')' must be masked with a '\'
(where parenthesis have a different meaning)
Allow selects in set key

Use: `set title '$(select system from data limit 1;)'`
Plus some minor fixes
update copyright
update README and mail address in sqlplot