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2014-09-18lib: Add basic README.Damien George
2014-09-13py: Implement divmod, % and proper // for floating point.Damien George
Tested and working on unix and pyboard.
2014-09-11py and libm: Add asinf,acosf; print higher precision for float.Damien George
Also use less stack space when printing single precision float. Addition of asinf and acosf addresses issue #851.
2014-08-29lib, libm: Add back dummy definition of tanf.Damien George
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.