Support "k or more" in fault tree generation

[jjhugues]

The generation of kormore in FTA is not done. I completed the implementation with the following hypothesis

• regarding the graphical output, KORMORE for the moment is just an icon + computed property. It does not have the 'k' value displayed.

I proposed to change it to

'<component name>
kOrmore *with k = xxx* in transition <transition name>
<probability value>

• FTA generation has been adjusted for this new gate

• Probability conputation has been adjusted accordingly

TBD: test