Tooltip for title or long field

[melTr]

Adding a tooltip so we know the meaning of each column headtitle (R, R, Q, F, P is not obvious)

When a field doesn't fit in column width, show a tooltip with the complete content.

Thanks

[oscargus]

Thanks for your input. This issue is actively discussed among the developers, so something will happen. :-)

[matthiasgeiger]

Postponed to 3.1 (will be part of a general overhaul of the MainTableFormat).

[stefan-kolb]

Also see #315

[matthiasgeiger]

Implemented with #452 - changes are available now in current development builds and will be released with 3.1