Also use the whole device surface if one of the extents is zero or 
negative and the mapping mode is MM_ANISOTROPIC or MM_ISOTROPIC.
New tests.

We are only checking against GL_MAX_TEXTURES when binding samplers,
when we should be checking against the maximum number of samplers that
the card supports.  Spotted by H. Verbeet.

- forward MLGetUILanguage to kernel32
- correct type of parameter to MLLoadLibrary

result in premature termination of the send.