fix to VARIANT class
some fixed and extension for Variant date
Merge remote-tracking branch 'upstream/master'

Conflicts:
	contrib/platform/src/com/sun/jna/platform/win32/Kernel32.java
	contrib/platform/src/com/sun/jna/platform/win32/OleAuto.java
Merge pull request #200 from wolftobias/master

some changes for the Variant date structure