Annotation For xvfs-create-synthetic

Origin for each line in xvfs-create-synthetic from check-in fc90ef3457:

c8742de968 2019-09-20    1: #! /usr/bin/env tclsh
c8742de968 2019-09-20    2: 
c8742de968 2019-09-20    3: set sourceDirectory [file dirname [file normalize [info script]]]
c8742de968 2019-09-20    4: lappend auto_path [file join $sourceDirectory lib]
c8742de968 2019-09-20    5: package require xvfs
c8742de968 2019-09-20    6: 
c8742de968 2019-09-20    7: proc ::xvfs::callback::setOutputFileName {args} {
c8742de968 2019-09-20    8: 	return "/"
c8742de968 2019-09-20    9: }
c8742de968 2019-09-20   10: 
fc90ef3457 2019-09-20   11: dict set ::myOwnVFS "" {
fc90ef3457 2019-09-20   12: 	type directory
fc90ef3457 2019-09-20   13: 	children {foo xvfs-create-synthetic}
fc90ef3457 2019-09-20   14: }
fc90ef3457 2019-09-20   15: dict set ::myOwnVFS "foo" {
fc90ef3457 2019-09-20   16: 	type file
fc90ef3457 2019-09-20   17: 	fileContents "abc"
fc90ef3457 2019-09-20   18: }
fc90ef3457 2019-09-20   19: dict set ::myOwnVFS "xvfs-create-synthetic" {
fc90ef3457 2019-09-20   20: 	type file
fc90ef3457 2019-09-20   21: }
fc90ef3457 2019-09-20   22: 
fc90ef3457 2019-09-20   23: proc ::xvfs::callback::addOutputFiles {fsName} {
fc90ef3457 2019-09-20   24: 	dict for {outputName fileContentsDict} $::myOwnVFS {
fc90ef3457 2019-09-20   25: 		set inputFile $outputName
fc90ef3457 2019-09-20   26: 		if {[dict exists $fileContentsDict inputFile]} {
fc90ef3457 2019-09-20   27: 			set inputFile [dict get $fileContentsDict inputFile]
fc90ef3457 2019-09-20   28: 		}
fc90ef3457 2019-09-20   29: 		::xvfs::processFile $fsName $inputFile $outputName $fileContentsDict
fc90ef3457 2019-09-20   30: 	}
fc90ef3457 2019-09-20   31: 	return [dict keys $::myOwnVFS]
c8742de968 2019-09-20   32: }
c8742de968 2019-09-20   33: 
c8742de968 2019-09-20   34: ::xvfs::run --directory [pwd] --name synthetic