BUG: Like cygwin, mingw does not produce .lib file for shared libraries, so search for dll when searching for library

ENH: On Cygwin shared libraries have only .dll file no .lib file, so when finding library on cygwin, search also for .dll. Also fix SimpleInstall test on cygwin

BUG: CopyFileIfDifferent should return success if the files did not differ or if the copy succeeded.  It should return failure only if the files were different and the copy failed.

ERR: Removed use of FILE command and using WRITE_FILE instead.  We would still like CMake 1.6 to be able to build CMake CVS, and kwsys is used.

ENH: Added GetExceptionString method to provide an error description when GetState returns Exception.

BUG: CollapseFullPath was calling SplitProgramPath before changing the working directory to in_base.

MSVC 6.0.

ENH: Merging changes from KWSys-IOS-bp to KWSys-IOS-b2t-1-mp to main tree.  This introduces separate kwsys_ios and kwsys_stl macros needed to support all platforms.

ENH: All platform tests are now in kwsysPlatformCxxTests.cxx.  This makes the listfile code much more readable.

ENH: Split kwsys_std into kwsys_ios and kwsys_stl in order to avoid std namespace pollution and support more platforms.

ENH: Added SetPipeShared method to allow stdout and stderr pipes to be shared with the parent process.