dpans2texi

The dpans2texi script patched to work in modern environment, namely when makeinfo supports unicode and does not tolerate random ASCII chars in the input file, a couple of typos were also fixed.

The purpose of dp2ansi script is to take advantage of the superior qualities of the Info reader in Emacs compared with other formats, viz.
* Single-key index lookup with completion: i.
* Single-key full text regexp search: s
* Convenient symbol lookup from source code: C-h C-i (or C-c C-d h from slime).