Move clang-analyzer-optin.cplusplus.VirtualCall suppressions to comments

[sweemer]

Ideally there should be no need to suppress this check, because no virtual functions should be called in any constructors or destructors as a general design rule. However, user code probably depends on the current behavior, so I have left the current behavior as is and have simply moved the suppression to comments so that at least any new code can be flagged before it is released.

[coveralls]

Coverage: 71.867% (-0.007%) from 71.875% when pulling 115fd75c43b680f548bd72fad1921d673926dbf4 on sweemer:virtual-call into 94b218eadbf8ba42ec1906fe4f3606c778f74639 on lballabio:master.

[lballabio]

Let me sit on this a bit — I'll check some of the issues.

[lballabio]

I removed a few of the calls where it made sense. Thanks!