support for multiple file anchors in Famix

Name: Famix-SourceAnchor-usmanbhatti.44

Author: usmanbhatti

Time: 8 August 2014, 3:43:01.966938 pm

UUID: 2e5e4d96-f927-4a96-9b6e-e8f0e1507eae

Ancestors: Famix-SourceAnchor-VincentBlondeau.43

adding FAMIXMultiFileAnchor, a source anchor for entities defined in multiple files. It has a collection of FAMIXFileAnchor objects which point to the individual definition files. It makes sure not to duplicate FAMIXFileAnchor with similar names/paths to optimize memory. SourceText returns the string of all FileAnchor contents with a separator line  between them. 

To create, Use FAMIXSourcedEntity>>defineMultiSourceAnchorWithPath:. See tests.

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Moose build is as unstable at it was before this change.