mshtml: Added IHTMLTable::width property implementation.

[Zhenbo Li]

try 2:
Thanks for Jacek's suggestions.
   1. Convert float to int in getter, instead of setter.
   2. Make the helper more generic (var2str)
   3. Don't mistake HRESULT/nsresult
   4. Don't use return_nsst in the old way
   5. More strict in cmp_length

origin:
As my test case shows, windows would truncate float numbers.
I considered VarInt() in oleaut32.dll, but I think to declare
var2str_length() is more clear.


---
  dlls/mshtml/htmltable.c | 80 
++++++++++++++++++++++++++++++++++++++++++++++---
  dlls/mshtml/tests/dom.c | 67 +++++++++++++++++++++++++++++++++++++++++
  2 files changed, 143 insertions(+), 4 deletions(-)


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