define-allのバグ修正。
エスケープ文字に制御文字を追加。
else=#t と定義。
undefined値を追加。
append のバグ修正。
バグ修正（関数適用時、 毎回新しくフレームを追加して評価を行なう必要）。
Merge commit '988b0eb29ad53876c07dc67155f50fbc774a31c1'
Merge branch 'master' of https://github.com/Altech/Scheme-Haskell

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
Merge branch 'master' of https://github.com/Altech/Scheme-Haskell

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.