Set nSeg.min=1.

This is needed for #290.
Added epsilon-NTU model for slab.

This is for #290.
Added epsilon-NTU for slab.

This is for #290
Removed obsolete model
Added scripts for #290.
Added examples and set nSeg(min=1)

This is for #290.
Changed slab to use eps-NTU by default

This is for #290. For the FLEXLAB model, computing time is 4 times lower with this configuration
Added Examples directory
Corrected documentation
Updated radiant slabs.

This is for #290
Updated package.order for #290.
Merge pull request #293 from lbl-srg/issue290_tabs

Issue290 tabs