Less version 418

Version 418 was released on 2 Jan 2008.

These are the differences between version 416 and version 418:

• Color escape sequences are now supported in WIN32 build.
• Makefile now uses EXEEXT feature of autoconf.
• Fix search bug when using -R and text contains ANSI color escape sequences.
• Fix crash when using -r with UTF-8 text containing 0x9B bytes.
• Fix display bug when using ' command to move less than one page forward.
• Update GPL to version 3.