more rewrites
more todo
disabled auto-tactics, customizable
smarter indentation using rectangles

Instead of running indent-region on whole replacement, indent
after newlines, and preserve relative indentation within sexps
following rectangular layout.
remove NL before multiline blocks
kill/yank rectangular sexps
use standard kill ring for rect kill/yank

Also, fixed end-boundary bug in sexprw-rectangle.
added to readme
clean up, refactor new rect code
namespacing
edit todo, comments, docstrings