D24145: Add the cylindrical Bessel function of the first kind of order 0

[Yuri Chornoivan]

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REVISION SUMMARY
  The current standard C++ implementation (cyl_bessel_j) is restricted to C++17 (or tr1 for GCC). GSL or Boost dependency is too much for lightweight KmPlot.
  
  The proposed code is adopted from Boost. It is just a proposal of how Bessel functions can be implemented.

TEST PLAN
  1. Compile, install, and run KmPlot.
  2. Create a Cartesian plot and enter "J0(x)" for f(x).

REPOSITORY
  R334 KmPlot

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24145

AFFECTED FILES
  kmplot/parser.cpp
  kmplot/parser.h

To: yurchor, #kde_edu
Cc: kde-edu, narvaez, apol
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