Fixes related to stack_solve_algo=7

Johannes Pfeiferrequested to merge
JohannesPfeifer:dynare_solve into master
  • Prevent using str2func on function handle
  • Do not display debugging info for perfect_foresight_solver in lnsrch1.m
  • Make csolve compatible with used sparse matrices
  • Adjust unit test
  • Use correct termination criterion in `dynare_solve'
  • Provide interface to original PATH files

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