Work to get BTree working for xml and text traces

Change-Id: I6856630a3a6980f8fea380502b977129e50fa63b
Fix NPE when deleting supplementary files in experiment

Change-Id: I7ba4577b8cdfe64af000589ff0e354ea3aa8f05b
Bug 416578 - [TMF] Select/Deselect All buttons in delete supplementary files

Change-Id: I47db7273801dd829807b63aa99044521892163cf
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>