nothrow for Fiber

- remove FiberException

- attribute all functions with nothrow except for call

- add templated Fiber.call(bool rethrow)()
Add missing alias for c_long_double on Solaris.

cc (sunpro) and gcc on Solaris use 80bit reals for the C `long double` data type.
Merge pull request #1033 from redstar/solaris

Add missing alias for c_long_double on Solaris.
Merge pull request #1021 from MartinNowak/fiberNothrow

nothrow for Fiber