1390 - support non-integer literals

Since '3.14159:literal' looks ugly, we'll just say '3.14159'. It's not
like non-integers can be confused for anything but literals.

Once I tried to turn reagent values into doubles, I uncovered a bug:
arithmetic using signed integers is busted; if either operand of
subtraction is unsigned the result is unsigned as well. If it needs to
be negative: ka-boom. It was only masked because I was eventually
storing the result in a long long int, where it was out of range, and so
overflowing into the correct signed value. Once I switched to doubles
the unsigned value would indeed fit without overflowing. Ka-boom.

Yet another reminder that unsigned integers suck. I started using them
mostly to avoid warnings in loops when comparing with .size(), which is
usually a size_t.

Who knows what other crap lurks here. Just use signed integers
everywhere. (And avoid bitwise operators.)

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