Use exceptions for UnitAlgebra errors

[berquist]

Closes #1037

Here is a proposal for adding exceptions to the core public API. Doxygen is missing until we decide on the form of exceptions.

Thoughts:

• Since these exceptions are specific for UnitAlgebra, I've added them inside the UnitAlgebra class rather than just the header.
• There is a base UnitAlgebraException in case a consumer (elements, some other code) wants to catch a more generic exception type rather than one of the more specific types.
• The base UnitAlgebraException inherits from logic_error rather than exception since these are fundamentally not runtime errors.
• As a development guideline, it seems like reasons/messages given by C++ exceptions should be actionable directly Python side: the message passed to PyErr_SetString should always be exception_instance.what().

For the tests, I used assert statements rather than the existing correct_throw idiom.

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[feldergast]

Looks good. This will be a nice addition.

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Repo: CORE (berquist/sst-core)

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Repo: ELEMENTS (sstsimulator/sst-elements)

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Repo: MACRO (sstsimulator/sst-macro)

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Pull Request Author: berquist

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