Merge branch 'u/gh-tejasvicsr1/special_functions_for_lazy_series' of …

…git://trac.sagemath.org/sage into t/32324/lazy_taylor_series

* 'u/gh-tejasvicsr1/special_functions_for_lazy_series' of git://trac.sagemath.org/sage:
  Corrected the names.
  Re-did hypergeometric series and completed inverse hyperbolic functions.
  Added some documentation for reversion, changed the name.
  Added hypergeometric function.
  Added all trig, inverse trig, hyperbolic functions, and exponential functions.
  Formatting
  Shortened the code for the old series, completed all the trigonometric functions.