Merge with crew-stable

patch: handle empty vs no file in git patches (issue906)

patch: remove CRLF when parsing file names

Merge with crew-stable

Document --base null in bundle help

Merge with mpm

util_win32: implement posixfile_nt.writelines() Used by the keyword extension.

New extension to support problematic MBCS on Windows. The aim of this extension is to clear the problem related to having 0x5c in 2nd byte of encoded bytes. So this extension is usefull for: * Japanese Windows user shift_jis encoding. * Chinese Windows user using big5 encoding. To use this extension, simply enable it without any customization. Note that some important python built-in functions and mercurial functions are altered for this extension to convert argument if need to handle MBCS.

Fix not to use os.sep directly. This change is intended for MBCS support.

Add util.splitpath() and use it instead of using os.sep directly. This change is intended to allow hooking splitpath() by win32mbcs extension for MBCS support.

Add endswithsep() and use it instead of using os.sep and os.altsep directly. This change is intended to allow hooking endswithsep() by win32mbcs extension for MBCS support.

Use util.normpath() instead of direct path string operation. This change is intended to allow hooking normpath() by win32mbcs extension for MBCS support.