Improved converttonotebooks, made math tree and image notebooks

documentation/doxygen/converttonotebook.py

documentation/doxygen/filter.cxx

tutorials/.vscode/.browse.VC.db

tutorials/.vscode/.browse.VC.db-wal

tutorials/fft/FFT.C

tutorials/image/galaxy_image.C

tutorials/image/hist2image.C

tutorials/image/hsumanim.C

tutorials/image/image2hist.C

tutorials/image/img2pad.C

tutorials/image/imgconv.C

tutorials/image/pad2png.C

tutorials/image/rose_image.C

tutorials/image/trans_graph.C

tutorials/math/Bessel.C

tutorials/math/ChebyshevPol.C

tutorials/math/CrystalBall.C

tutorials/math/FeldmanCousins.C

tutorials/math/GammaFun.C

tutorials/math/Legendre.C