rename ParserAndBuilder to ValueFormat
rename CssSizeValueFormat to CssSizeFormat
rename ValueFormats to ValueParserAndBuilder
valueFormats = array of ValueFormat, used to construct ValueParseAndBuilder
cssSize1ComponentEditorModel as a function
change sample h2 margins
cssSizeEditorModel and fourCssSizesEditorModel
CssSizeDenormaliser
css size denormaliser
FourCssSizesDenormaliser
inspect function
step & precision in size ranges
remove tracing statements
derive precision from step size
RangesForUnit
remove trace statements
RangesForUnit adjustments
list property editors
update help for property editors
fix tab scrolling