multiselect when importing trial from xma file

[Dave Baier]

When importing a trial from another xma file, it would save a lot of time if one could choose all or at least multiple files. I realize that the actual import would take longer, but it would still be much less cumbersome and time consuming than having to select each trial individually.

[Dave Baier]

Also would be helpful to delete multiple trials at once without having to wait for each trial to load. I have a file with 20 trials that I wanted to switch to a different calibration and it takes a very long time to import the trials into the new calibration. Likewise, I wanted to delete all but one trial to send for troubleshooting but it takes a really long time to delete 19 trials.

[Benjamin Knorlein]

fixes #170 : Changed import to a multiselect dialog and added a new button in the mainwindow to delete multiple trials

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