#3985 opacity panel init

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31529 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4049: this way web applets can be manually resized, even if they are anywhere on a scrolled page

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31530 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4049: bug fixed in connection with context menu of CAS table headers (by the way, only the label text can be clicked, is it enough?)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31531 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4049: Algebra view context menu is also positioned at the right place now

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31532 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e