Apply the last patch by Rafael: non-interactive options for testing Octave
Apply patches by Rafael Laboissiere:
Add a routine to check for the Fortran 2018 feature that routines are recursive by default.
Building_PLplot_with_a_cross-compiler
Updated documentation, test program, parser and auxiliary program
Initial import
Added new functionality - tree structures and the start of a new approach
Added new program (xmlreader) and a few examples for the use of that program.