Implement an overflow-checked version of LCM#77
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Add `checked_lcm` and `checked_gcd_lcm` as counterparts to existing `lcm` and `gcd_lcm` functions, in which the LCM may be None in the case of overflow.
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Fixes #76 by introducing
checked_lcmandchecked_gcd_lcmfunctions. They behave the same as the existinglcmandgcd_lcmfunctions, except the LCM will beNoneif and only if the LCM of the two integers is too big for the type they are being stored as. Uses the functionchecked_mul.