CMake linkage is now:
 TabProps::tabprops
and
 TabProps::interp

Dependencies should propagate better now.

Add pytabprops support for the mixing model without Cantera

See merge request !12

add basic 1D interpolant testing and very basic PDF testing (just running the code, no correctness checks) for pytabprops

Enable the mixing model libary without Cantera and add mixing model methods, get_pdf and integrate, to the pytabprops interface

- add ability to create TabProps table from Spitfire flamelet data

See merge request !11

- misc minor changes

- fix to index_finder

See merge request !10

Hard-code some paths on linux tests since the gitlab-runner user there apparently doesn't have the ability to set these up in a .custom.sh file.

  - Increase number of points in timings from ~100 to 10000.  This is more realistic of the sizes that we would be running in CFD applications, and shows more realistic performance numbers.
  - Reduce block size for thread counts to avoid overflows on GPU.

  - turn of preprocessor by default
  - a few changes to the search for cantera

Update build system to look for cantera installation automatically, optionally overriding the search with a specific cantera installation directory.

Move assert() from 1D constructor to its second_derivative method.

This will assure that there are enough number of points for second order derivative. Also lets the interpolator to run the value() method with less points (order+1)

See merge request !9

Clean up test files