Rename 'checks' attributes with a consistent pattern

[plaird]

Now that we plan to have more than one check, we should name them such that the attributes are easily identified and consistent. For example dupeclassescheck_enable should be renamed. Something like:

• check_dupeclasses_enable
• check_deps_maxcount Provide a check_deps_maxcount enforcement and attribute #149
• check_deps_mutualexclusive Provide a dependency mutual exclusion check #150

We will need to provide back support for the old attribute names. Our deprecated attr count is growing large, so create a different stardoc table for them. And fix that pages anchors while you are in there.

[plaird]

I dont think this is a good idea anymore.