Clean up implementation of VC 200x tool element maps

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extra : rebase_source : 6bdeab18c0a1b5f7262eb228d11e5bca8ff3536a
return an errorcode if testsuite fails

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branch : testsuite returncode
add ATL support

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branch : ATL support
Moved platform toolset selection into configuration system

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extra : rebase_source : 8d499c02f0ca5507e59e3129badb90233d4aa133
lower case the api call

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branch : ATL support
Merged in tbasnoopy/premake-dev/testsuite returncode (pull request #106)

return an errorcode if testsuite fails
Merged in tbasnoopy/premake-dev/ATL support (pull request #105)

add ATL support