cptBackbone - check for duplicate code values on import

[AronGahagan]

Problem:

Excel drops trailing zeros, so catch an attempted import of "1.1" (which would be a duplicate).

Solution:

Perhaps if the row after is 1.10.1 or something, assume it's 1.10? Risky.

Todo:

• [ ] assign this issue
• [ ] label the issue for enhancement or bug
• [ ] label the issue with codemodule (so fixes can be aggregated and hotfixed together)
• [ ] checkout appropriate branch and create topic branch
• [ ] design, code and test
• [ ] update codemodule x.y.z
• [ ] update CurrentVersions.xml manually
• [ ] commit changes prefix comment with Issue #XXX -
• [ ] merge topic into appropriate branch(es) and push
• [ ] delete topic branch