Makefile: simplified because of errors with some versions of Make.
Makefile: corrected filename: utf -> utfcode.
utf2any: added cast (unsigned char) in calls to isspace().
utf2any, README: added option [-w] to usage-message.
utf2any, utfcode: added version number 1.0 in usage-message.
utf2any, utfcode: observe U+7FFFFFFF as upper limit for UTF-8.
maps/html.map, maps/latex.map: upper boundary for default range set to
U+7FFFFFFF.
