The Add Morphism command is now able to detect in advance:  1) if the proposed morphism named has already been used  2) if the proposed signature matches the function type
The Add Morphism command is now able to detect in advance:
 1) if the proposed morphism named has already been used
 2) if the proposed signature matches the function type


git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@6158 85f007b7-540e-0410-9357-904b9bb8a0f7

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