In jst:

In jst:
* Allow to output either raw or transformed AST
* Fix several transformation bugs with "...arguments" syntax caused by lack of return statements in transform.js

In min_svg_cache:
* Fix prefix-setting bug causing SVGs not to display
* Make the prefix shorter

In ndcode_site:
* Add ticks, crosses and spinners in sign up form
* Move *.jst from / to /_lib to keep things tidy
* Implement /_lib/Problem.jst and /_lib/post_request.jst to contain repetitive code for API call implementation
* For the client side move /api/sign_up.js.min to more general /js/api_call.js.min
* Add sign up draft facility (avoids having to re-enter data if you refresh page)
* Fix scrollbar shifting problem again (fix was lost in upgrade to Bootstrap 4, because it moved the "Give feedback" button to left, but now I fixed that too)