Support Tcl\Tk 8.6 and associated tkimg1.4.2

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Install tcl8.6, tk8.6, tkimg1.4.2 and other CORE dependencies on Fedora 21
2. Install the latest CORE SVN snapshot
3. Start core-daemon (root)
4. Run core-gui (user)
5. File -> Open

What is the expected output? 
 Open Dialog appears with a list of sample scenarios

What do you see instead?
 Open Dialog is blank and a tcl/tk error dialog states an issue relating to loading certain image formats

Please provide any additional information below.
I think that there is an incompatibility with tcl\tk8.5 or tkimg1.4.2. I was 
able to install tcl\tk8.5 from source (fixes the problem) but I was not able to 
compile tkimg1.4.1. Luckily CORE will run without tkimg installed.

Original issue reported on code.google.com by [email protected] on 30 Jan 2015 at 4:54