Raise errors on 'assert'

[Affonso-Gui]

Always had some doubts regarding the euslisp assert function. When the assertation fails it just enters a new ass prompt without any relevant information.

This PR makes assert raise errors upon failure, printing the Call Stack and enabling dynamic evaluation on the error point.

1.eus$ (let ((a 10)) (assert (zerop a)))
Call Stack (max depth: 20):
  0: at (assert (zerop a))
  1: at (assert (zerop a))
  2: at (let ((a 10)) (assert (zerop a)))
  3: at #<compiled-code #X6030a58>
eus 0 error:  Assertation Error in (assert (zerop a))
2.E1-eus$ ,a
10

[Affonso-Gui]

@k-okada @furushchev @mmurooka Accepting comments.

[Affonso-Gui]

Changed base to cl-compatible for testing features