(hif-token-alist): New var.

(hif-token-alist): New var.
(hif-token-regexp, hif-tokenize): Use it.
(hif-mathify-binop): New macro.
(hif-plus, hif-minus, hif-notequal, hif-greater, hif-less)
(hif-greater-equal, hif-less-equal): Use it.
(hif-logior, hif-logand): New functions.
(hif-math): Accept | and & as well.