TimeSeries improvements: UI, bugfixes. Added unit tests.

source drop for fittoview func

fixed bugs #527 and 516. Added padding mechanism

added links to pre-loaded dataSets

visual hints implemented

vertical gridlines implemented

changes to project

fixed bugs #494, #498, #503

line clipping implemented

fixed #502, #511, #517

more unit tests. Some refactoring
merge from main
Finalizing merge #635