New tags for wavelet-estimation-interval

[alfbr]

Previously we had:

<wavelet-estimation-interval>
<top-surface-file> surface.txt </top-surface-file>
</wavelet-estimation-interval>

With the support of constant time surfaces, this should now look like:

<wavelet-estimation-interval>
   <top-surface>
       <time-file>  surface.txt </time-file>
  </top-surface>

<wavelet-estimation-interval>
 <top-surface>
       <time-value>  1500 </time-value>
 </top-surface>

The gui needs to be updated accordingly.

[hgolsen]

This is change is also added for estimation intervals under facies probabilites, the new setup is

surface.txt

or

1500

[alfbr]

All functionality related to this issue is now implemented. Will close issue after initial testing.