added multisel of scene panel and delete multiobj by multisel
impl of multi-copipe
Merge branch 'master' of github.com:CueMol/cuemol2

Conflicts:
	src/qsys/StreamManager.cpp
	src/qsys/StreamManager.qif
	src/xul_gui/chrome/content/workspace_panel.js
	src/xul_gui/chrome/content/workspace_panel_copipe.js
	src/xul_gui/chrome/content/workspace_panel_ctxtmenu.js
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