Create vignette with version support

[peterdesmet]

Package

version	v1	v2
$schema	assumed v1 if undefined	used to detect v2
profile	ignored	ignored
version	ignored	ignored
contributors	ignored	ignored
sources	ignored	ignored

Resource

version	v1	v2
$schema	assumed v1 if undefined	used to detect v2
profile	must be tabular-data-resource	ignored
type	ignored	must be table (not detected from file extension)
sources	ignored	ignored
name	not strict (!)	not strict
path	forbids hidden paths (!)	forbids hidden paths
encoding	assumed UTF-8 if undefined (!)	assumed UTF-8 if undefined (!)

Dialect

version	v1	v2
$schema	assumed v1 if undefined	used to detect v2
caseSensitiveHeader	ignored	ignored
csvddfVersion	ignored	ignored
property	ignored	ignored
itemType	ignored	ignored
itemKeys	ignored	ignored
sheetNumber	ignored	ignored
sheetName	ignored	ignored
table	ignored	ignored

Schema

version	v1	v2
$schema	assumed v1 if undefined	used to detect v2
schema.missingValues labelled	error	supported
schema.fieldMatch	ignored	supported
schema.primaryKey	ignored	ignored
schema.uniqueKeys	ignored	ignored
schema.foreignKeys	ignored	ignored
field.categories	ignored	supported
field.categoriesOrdered	ignored	supported
field.constraints.enum	read as factor	ignored
field.missingValues	ignored	supported
groupChar integer	supported (!)	supported
list type	as character	supported
datetype default milliseconds	supported (!)	supported
geojson	as character	as character
any	guess	as character
constraints	ignored	ignored