In scripts/medley/medley_vnc.sh, update references to Xvnc and vncviewer to their tigervnc-specific versions Xtigervnc and xtigervncviewer. Fixes Issue#1841.
Note that medley.sh is just a symbolic link to medley.command (to accomodate MacOS). medley.command should not be edited directly. It is compiled from all the of the medley_*.sh components. The script compile.sh does this compile (with help from the inline.sh script).