Ability to select channels from several logs and show them all in one view

[ThomasHalland]

Today we often want to see curves from several logs in the same content view.
When a user selects several logs, rightclick and selects open, then WEx will show all the curves from all the logs in the same content window.

An extra column will be added to the content window, to show which log each curve comes from.
Default sorting of curves will be on this new column so that all curves from Log A is listed alphabetically before all the curves from Log B, when all curves from Log C etc... As normal a user can decide to chance the sorting by clicking on the headers.

The new column shall by default be located between mnemonic and minIndex, and the name of the column shall be "logName":

The breadcrumb can be one of these alternatives:

1. it can at the lowest level contain all the log names like this / Depth / Downhole Logging Data - Depth RT | Surface Logging Data - Depth RT. The full text will as today be available through mouse-over.

2. It can stop at depth level (if there are problems implementing nr 1)