hdf5

[svn-r14854] Purpose: Remove many spurious compiler warnings in Visual Studio

Description:
On Windows, many POSIX functions have been replaced by a similarly-named function with some additional security-checking.  Visual Studio issues a warning each time the POSIX version is used, recommending that we replace it with the new version.  This results in thousands of errors when building the HDF5 library.

This checkin adds a Visual Studio "Property Sheet", which has been applied to all library projects, and defines a number of preprocessors to suppress these warnings.  The warnings have been disabled only in Visual Studio 2005 project files, as VS.NET doesn't support property sheets.

Tested:
VS2005 on WinXP