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2014-12-18lib/libm: Add acosh, asinh, atanh, tan; get working with stmhal.Damien George
acoshf, asinhf, atanhf were added from musl. mathsincos.c was split up into its original, separate files (from newlibe-nano-2). tan was added. All of the important missing float functions are now implemented, and pyboard now passes tests/float/math_fun.py (finally!).
2014-08-29lib: Add lib and libm, moving current files from stmhal.Damien George
Top-level lib directory is for standard C libraries that we want to provide our own versions of (for efficiency and stand-alone reasons). It currently has libm in it for math functions. Also add atanf and atan2f, which addresses issue #837.