expint.m: Overhaul function. Better accuracy and faster performance. Improved documentation and added %!tests. * scripts/specfun/expint.m: Improved accuracy of calculations by adjusting quad() tolerance options. Speeded up performance by breaking out of series summation as soon as possible. Used persistent variables to avoid re-calculating expensive intermediate values. Added %!tests verified against arbitrary precision Mathematica calculations.

((nil .
      ((c-file-style . "gnu")
       (indent-tabs-mode . nil)
       (fill-column . 72)
       (eval . (when (string-match "\\.h\\'" (buffer-file-name))
                 (unless (string-match "/gnulib/" (buffer-file-name))
                   (c++-mode)
                   (c-set-style "gnu"))))))
 (change-log-mode . ((indent-tabs-mode . t)))
 (makefile-mode . ((indent-tabs-mode . t))))