Tweaks:
* --headers command line option, which can be used to
enable/disable the automatic headers, and the
automatic empty lines between samples.
* --show-timestamps, which changes the #ts line with
a timestamp in the HH:MM:SS format.
* Always use ReadKeyMini, even when we have Term::ReadKey.
In the latter case, use the Term::ReadKey functions,
but if they fail, try again with our own versions.
Fix:
Looks like I forgot to actually enable the "save the current, first
and last" samples. This is now on. It should mean faster and better
output when changing --group-by modes.
Still TODO: Attributes still have a single method that doubles
as a getter and setter. The constructor for Diskstats is still
weird -- A tad more stricter than it should be, if anything.
->print_rest is still rest, even though that's hardly
memorable, mostly because of a lack of ideas on what to
rename it. The main loop in the Menu is still a while (1).
As a nice perk, it's nearly twice as fast now! It also adds a
_very_ experimental --memory-for-speed argument, which
turns on memoization for the current biggest bottleneck.
With this most of the interactive mode should be working.
pt_diskstats.pm has the documentation and can be used for testing,
which should be in the next commit.
This commit also includes the revamped command line options.
