Auto scaling and other changes.

Graphics:
Implemented auto scaling.

GUI:
Clarified symbol width in OpenFile panel's caption text.
Buttons like 'scale', 'reset', and 'reset all' now disabling auto scaling.

Bugs:
Fixed bug with OpenFile panel's caption [AGAIN] (missed another one last letter).

DON'T DO THIS:
Don't make program remember last added series to chart at it's start!
Auto Scale must always ON at start!
Don't store path to file in panel caption.