We can export & save data as images and tables on several places in piwik.
At this time they have no to partly little speaking file names
e.g. "index.png" or "Piwik Export__2014.csv"...

Would be very handy, time saving, comfortable and professional looking in daily usages
(during download, storage, search...)
if we could establish a schema for all data save and export possibilities.

One idea may be to use something like:
Piwik_Website_Shown-Data_Period.type

example:
Piwik_IssueTracker_visitors_01012013-31122013.csv

What do you think?