[math] Eliminating [lang] dependency

[Phil Steitz]

I just opened a ticket (#29948) and attached a patch that pulls the 
implementation code from lang's NestableException into MathException. This 
would eliminate the [lang] dependency.  The full implementation is 
included, which is probably overkill and may push things over the "small 
amount of code" limit.  Before committing, I wanted to give others the 
opportunity to suggest alternatives.  In any case, I would need to add 
some more test cases (and test with 1.3, rather than commenting out the 
1.4 check as the patch does).

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