[cl-interpol-devel] [PATCH] bugfix and "feature"

This patch does 2 things (with tests): * Fixes a bug where e.g. "123${x}" didn't get expanded correctly, by adding a needed copy-sequence. * Adds an option *optional-delimiters-p* that allows you to use the syntax #?"$x 123", where 'x' is interpolated without brackets, and delimited by whitespace. /s