Added acceptance of string anchors/sides for TkInter such as "w" and "top"#158

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TRManderson wants to merge 3 commits intoCSSE1001:masterfrom

TRManderson:gui-flexibility

Commits on Apr 21, 2015

Added acceptance of string anchors/sides for TkInter such as "w" and "top"
TRManderson
committed
Revert acceptance of string anchors/sides for TkInter
TRManderson
committed
Added detailed error for valid but deprecated tkinter constants
TRManderson
committed