General copyedit
Revamped Basics sections a bit so description of how schema made up more
closely resembles later breakdown
Add "wrapper" section for describing structure
switch to linkless <a> elemetns as described in ReSpec docs
Further tweak of Basics for consistency of usage
tweak example csv data, slight reword in Basics
Introduce Schema structure subsections
Refactoring for readability and consistency
General intro to Global Directives
complete separator directive
complete Quoted Directive section
Begin Total Columns Directive section
remove duplicate definition statement
complete TotalColumnsDirective section (and tidy)
add No Header Directive section
Add Ignore Column Name Case Directive section to body
add Ignore Column Name Case Directive to EBNF appendix
add basic def of schema struct in EBNF form
tweak
make linking too and from appendix consistent