1. serious bug in wxRegConfig corrected - deleting a value would delete the

1. serious bug in wxRegConfig corrected - deleting a value would delete the
   key containing it if it didn't have any subkeys (i.e. would delete the
   sibling values)
2. wxRegKey::GetFirstValue() starts with first value, not the second one
3. typo in wxStaticText::DoSetSize() which prevented width.AsIs() from
   working fixed
4. adjustment for the parent client area offset not done for the top level
   windows (dialogs and frames) any more

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2904 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775