Made friends more explicit in btree, hoping to please GCC...
Made friends more explicit in btree, hoping to please GCC...

blazs/qminer,blazs/qminer,blazs/qminer,mkarlovc/qminer,mkarlovc/qminer,ErikNovak/edsa-server,ErikNovak/QVisual,blazs/qminer,blazs/qminer,mkarlovc/qminer,mkarlovc/qminer,mkarlovc/qminer,ErikNovak/edsa-server,blazs/qminer,ErikNovak/data-visualization,ErikNovak/QVisual,mkarlovc/qminer,ErikNovak/data-visualization