support.

It allows initializing at runtime an strb. This can't always be done at
compile-time, for instance if it is dynamically allocated.

Spaces after a bunch of keywords, do certain string appends more
efficiently, no appending includes.

All tests pass, but currently the codegen is locked to the large code
model (the small code model has most of the groundwork laid down but has
several extra complexities which haven't yet been implemented, like
atomic reduction operators.

Clang and MSVC correctly recognize that all paths to the allegedly-
uninitialized variables are, in fact, dominated by their initialization.

40% of tests still failing, and the code has a wierd smell to it that I
really don't appreciate.

All tests now pass except summation, which fails to meet tolerance.

- Subtract 0.5 from random numbers, so they sum to 0 in expectation.
- Increase tolerance from 1e-5 to 1e-4 just for summation.

doubles the speed.

Now, all the veryhighrank tests pass and the others fail for an unknown
reason.

They are overkill but seem to fix the problems with the testcases, at
least so far.

There is now not a single -Wdeclaration-after-statement warning
origination in that file.