HTTP/1.1 support and Chameleon, native look for Tk widgets

by Vivia Nikolaidou for Tcl Community Association

The first part of this project deals with HTTP/1.1 support in Tcl: * Chunking: needs compatibility with the -channel and -handler options * Support for pipelined requests in keepalive connections * Support for SOCKS and authenticating HTTP proxies with SSL connections * Support for SSPI authentication The second part is about the Chameleon plugin, which gives native or pixmapped look to Tk widgets: * Tcl/tk 8.5 and 8.6 compatibility * Adaptation to use snit