reset the tikzMetricsDictionary option on exit
the input path must be adjusted according to the last parent input file
closes #701: export a trivial utility function current_input()
roxygenize
\\ can be the empty column name in reST, so do not use 'id' as the default
closes #699: added a padding argument to kable() for markdown tables
roxygenize
fixes #705: make sure markdown tables have at least one empty line before them
bump version