Stretched GUI elements in the tab "Search by identifier"

[MarioLocati]

@nyalldawson In both sub-tabs "Search by identifier" of the tabs "Earthquake parameters" and "Macroseismic data" the groups "Output table" and "Style" are streched vertically when the window is resized vertically leading to an unreadable content, see below.

This should not happen, when the content of the window cannot be show entirely because of a too small window, a vertical scrollbar should appear letting the user scroll all of its content visually well preserved.

[MarioLocati]

The same strecthing of GUI elements (e.g. Depth) applies to the sub-tab "Load QuakeML directly".