Bug#1032280: fv may not start if another Tcl/Tk is installed

[Ole Streicher]

Package: ftools-fv
Version: 5.5.2+dfsg-1
Severity: important
When another Tcl/Tk is installed, f.e. from Astroconda, and its "wish" 
shell precedes the system's one, fv may not work properly, because the 
wrong "wish" command is used.