added Macro basics tutorial for 2019-09

...JMacroBascis1_3h/Tutorial_IJMacrosBasics1_2019-09-17.pptx

...croBascis1_3h/data/download_from_registration_webpage.txt

...acroBascis1_3h/macros/1_language_basics/good_comments.ijm

...oBascis1_3h/macros/1_language_basics/string_variables.ijm

..._IJMacroBascis1_3h/macros/1_language_basics/variables.ijm

...cis1_3h/macros/3_working_with_images/image_statistics.ijm

...3h/macros/3_working_with_images/read_image_properties.ijm

...cis1_3h/macros/3_working_with_images/stack_navigation.ijm

...cis1_3h/macros/4_customizing_macros/custom_parameters.ijm

..._2019_IJMacroBascis1_3h/macros/5_loops/process_folder.ijm

...ial_2019_IJMacroBascis1_3h/macros/5_loops/simple_loop.ijm

...croBascis1_3h/macros/input_to_exercises/analyze_blobs.ijm

...t_to_exercises/segment_cells_input_for_generalization.ijm

...cros/input_to_exercises/troubleshooting_error_message.ijm

...put_to_exercises/troubleshooting_with_code_highlights.ijm

...Bascis1_3h/macros/solution_to_exercises/first_example.ijm

.../macros/solution_to_exercises/multichannel_image_luts.ijm

...Bascis1_3h/macros/solution_to_exercises/open_and_save.ijm

...ution_to_exercises/process_folder_multichannel_images.ijm

...Bascis1_3h/macros/solution_to_exercises/segment_cells.ijm