defaultTR: Default settings for the trust-region part of COBRA.
In SACOBRA: Self-Adjusting COBRA

Sets default values for the trust-region part cobra$TRlist of SACOBRA.
With the call setOpts(myTR,defaultTR()) it is possible to extend a partial list myTR to a list containing all TR-elements (the missing ones are taken from defaultTR()).

1	defaultTR()

a list with the following elements

`shape`	["cube"] Shape of the trust region can be chosen between cube or a sphere `[cube\|sphere]`
`radiMin`	[0.01] A value betwwen 0 and 1, minimum fraction of the width of the search space to be used as radius of the trust region
`radiMax`	[0.8] A value between 0 and 1, maximum fraction of the width of the search space to be used as radius of the trust region
`radiInit`	[0.1] Initial radius of trust region
`center`	[cobra$xbest] Center of the trust region can be the current bwst solution or the new solution`[xbest\|xnew]`