- Update to version 2.7.1:
  * New symbolic command: numdem
  * Fixes for SymPy 1.3.
  * Various bug fixes and documentation updates.

- Update to version 2.7.0:
  * New symbolic commands: arg, euler, ezcontour
  * New `@double` numerical functions; these are wrappers around
    SymPy, so they are slower than native floating-point
    implementations: bernoulli, euler, chebyshevT, pochhammer,
    chebyshevU.
  * The initial startup is much quieter!
  * `vpa` now warns of low-precision on non-numbers strings with
    decimals such as `vpa('cos(0.1)')`. See "help vpa" for
    details.
  * `subs` allows multiple scalar variables to be replaced with
    symbolic matrix expressions.
  * symfun can be evaluated at symbolic matrices: `f(sym([1 2; 3
    4]))` now works where `f(x)` is a symfun.
  * Fixes for symfuns such as `syms N(t)` where the function name
    conflicts with a SymPy command.
  * Fixes for how assumptions interact with symfuns.
  * New command `sympref diagnose` to help debug Python/SymPy
    issues.
  * Improve `function_handle` support by supporting more
    functions.
  * Fixes for several bugs mentioning "immutable matrices".
  * `bernoulli` now works with array inputs.
  * Added a `private/defaultpython.m` to make it easier for
    distributors to control which python interpreter is used by

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