Making a Jalview release

Objectives

1 Update the release getdown channel 2 Update single executable jar 3 Update installer 4 Update web site with release notes 5 Update Conda recipe 6 Update Homebrew 7 Update JalviewJS

tl;dr

OSX_SIGNING=yes KEYPASS=MYSECRETKEY gradle -POSX_KEYPASS=true -POSX_KEYSTORE=/Users/jbb/buildtools/private/sourceofpain.p12 -PJSIGN_SH="/Users/jbb/buildtools/jsign.sh" -Pinstall4j_verbose=true -PJAVA_VERSION=1.8 -PCHANNEL=RELEASE -PVERSION=W.X.Y.Z getdown installers shadowJar codesign -s "MY Apple Dev Name" build/install4j/1.8/Jalview-DEVELOPMENT-macos-java_8.dmg