* use new table data structure for diff and show
* fix params diff showing changes
* metrics show: use default precision
* skip precision format for exp diff params
* exp diff: separate tables in --quiet mode
* change precision to signify significants digits
changed f specifier to g, so that we show significant digits
instead of fractional digits. This does changes how precision
worked for metrics/params diff/show.
Saugat Pachhai
f38d163d5c