first attempt at a new student lesson
fixed some formatting and grammer errors
proposed replacement for shell-overview
Fixed the copious spelling errors
fixed 'grant_proposal' directory errors
revert tab completion to 'twice'
reinstate metadata
DOC move images under lessons/swc-shell/ -> img/lessons/swc-shell/

	renamed:    lessons/swc-shell/absolute_path.png -> img/lessons/swc-shell/absolute_path.png
	renamed:    lessons/swc-shell/absolute_relative_path.png -> img/lessons/swc-shell/absolute_relative_path.png
	renamed:    lessons/swc-shell/command_shell.svg -> img/lessons/swc-shell/command_shell.svg
	renamed:    lessons/swc-shell/decwriter.jpg -> img/lessons/swc-shell/decwriter.jpg
	renamed:    lessons/swc-shell/direct_shell_usage.png -> img/lessons/swc-shell/direct_shell_usage.png
	renamed:    lessons/swc-shell/filedir_challenge.png -> img/lessons/swc-shell/filedir_challenge.png
	renamed:    lessons/swc-shell/filesystem.png -> img/lessons/swc-shell/filesystem.png
	renamed:    lessons/swc-shell/find_file_tree.png -> img/lessons/swc-shell/find_file_tree.png
	renamed:    lessons/swc-shell/google_vs_grep.png -> img/lessons/swc-shell/google_vs_grep.png
	renamed:    lessons/swc-shell/home_directories.png -> img/lessons/swc-shell/home_directories.png
	renamed:    lessons/swc-shell/nano.png -> img/lessons/swc-shell/nano.png
	renamed:    lessons/swc-shell/nano_quotation.png -> img/lessons/swc-shell/nano_quotation.png
	renamed:    lessons/swc-shell/permissions_table.png -> img/lessons/swc-shell/permissions_table.png
	renamed:    lessons/swc-shell/process_stdin_stdout.png -> img/lessons/swc-shell/process_stdin_stdout.png
	renamed:    lessons/swc-shell/public_private_keys.png -> img/lessons/swc-shell/public_private_keys.png
	renamed:    lessons/swc-shell/relative_path.png -> img/lessons/swc-shell/relative_path.png
	renamed:    lessons/swc-shell/remote_shell_usage.png -> img/lessons/swc-shell/remote_shell_usage.png
	renamed:    lessons/swc-shell/running_a_process.png -> img/lessons/swc-shell/running_a_process.png
	renamed:    lessons/swc-shell/running_wc.png -> img/lessons/swc-shell/running_wc.png
	renamed:    lessons/swc-shell/running_wc_sort.png -> img/lessons/swc-shell/running_wc_sort.png
	renamed:    lessons/swc-shell/running_wc_sort_head.png -> img/lessons/swc-shell/running_wc_sort_head.png
	renamed:    lessons/swc-shell/shell_as_process.png -> img/lessons/swc-shell/shell_as_process.png
	renamed:    lessons/swc-shell/shell_on_shell.png -> img/lessons/swc-shell/shell_on_shell.png
	renamed:    lessons/swc-shell/vlad_homedir.png -> img/lessons/swc-shell/vlad_homedir.png
	renamed:    lessons/swc-shell/x_for_directories.png -> img/lessons/swc-shell/x_for_directories.png
DOC fix swc-lesson images' path after mv images to img\lessons\swc-shell

	modified:   _includes/guide-shell/create/lesson.html
	modified:   _includes/guide-shell/filedir/challenges.html
	modified:   _includes/guide-shell/filedir/lesson.html
	modified:   _includes/guide-shell/find/lesson.html
	modified:   _includes/guide-shell/intro/lesson.html
	modified:   _includes/guide-shell/pipefilter/lesson.html
Spell fixes for expanded functions-modules
Transfered expanded function-definition exposition
Added new set of material for a R only bootcamp

This material is based on @karthikram's bootcamp that was held in Canberra.
Laying out new material
Starting beginner's lessons on Python
Second beginner's lesson on Python
Third beginner's lesson on Python
Fourth beginner's lesson on Python
Added example multi-line indented block
Spelling and markup
More code markup