Simplify gitignore

.gitignore

@@ -9,21 +9,11 @@ doc/ctdeploy_key
 *.exe.manifest
 build/
 test/work/
-test_problems/ChemEquil_ionizedGas/ChemEquil_ionizedGas
-test_problems/cathermo/testWaterPDSS/WaterPDSS
-test_problems/cathermo/testWaterTP/WaterSSTP
-test_problems/cxx_ex/cxx_ex
-test_problems/diamondSurf/diamondSurf
-test_problems/pureFluidTest/pureFluid
-test_problems/rankine_democxx/rankine_democxx
-test_problems/surfkin/surfkin
 interfaces/cython/cantera/_cantera.h
 include/cantera/base/config.h
 include/cantera/base/config.h.build
 include/cantera/base/system.h.gch
 include/cantera/ext/
-interfaces/matlab/ctpath.m
-interfaces/matlab/Contents.m
 stage/
 .sconsign.dblite
 .sconf_temp
@@ -50,11 +40,43 @@ config.log
 *.gch
 coverage/
 coverage.info
-doc/sphinx/matlab/data.rst
-doc/sphinx/matlab/importing.rst
-doc/sphinx/matlab/kinetics.rst
-doc/sphinx/matlab/one-dim.rst
-doc/sphinx/matlab/thermodynamics.rst
-doc/sphinx/matlab/transport.rst
-doc/sphinx/matlab/utilities.rst
-doc/sphinx/matlab/zero-dim.rst
+
+# MATLAB
+src/matlab/*.m
+doc/sphinx/matlab/*.rst
+!doc/sphinx/matlab/index.rst
+interfaces/matlab/ctpath.m
+interfaces/matlab/Contents.m
+
+# test_problems folder
+test_problems/
+!test_problems/*.c
+!test_problems/*.cpp
+!test_problems/*.cti
+!test_problems/*.xml
+!test_problems/*blessed.*
+!test_problems/SConscript
+!test_problems/README*
+
+# interfaces folder
+interfaces/**/dist
+interfaces/**/setup*.py
+interfaces/**/*.egg-info
+interfaces/**/scripts/
+
+# cython folder
+interfaces/cython/cantera/*.c
+interfaces/cython/cantera/*.cpp
+interfaces/cython/cantera/**/*.cti
+interfaces/cython/cantera/**/*.xml
+interfaces/cython/cantera/**/*.inp
+interfaces/cython/cantera/**/*.dat
+interfaces/cython/cantera/**/*.csv
+interfaces/cython/cantera/**/*.yaml
+interfaces/cython/cantera/**/*.yml
+interfaces/cython/cantera/test/data/test_subdir
+
+# python_minimal folder
+interfaces/python_minimal/build
+interfaces/python_minimal/cantera/*.py
+!interfaces/python_minimal/cantera/__init__.py