Changes

These changes allow you to call the 4 clubb "advance" subroutines in any
order that you want to try. In the default order (where the order is the
same as found in the current version of the CLUBB master), results are
bit-for-bit when compared to CLUBB master.

Placing the order variables in a nice, convenient place for testing use.

I reordered advance_clubb_core so that the "Advance xp3" (which is a
basic calculation of xp3 by the ansatz by default) section is moved out
of the way of the "advance loop" to a point that is after
advance_windm_edsclrm (or whatever will be called last in the advance
loop.

This change does not alter the default results. Everything is still
bit-for-bit.

I am committing the idiot-proofing code that forces l_min_xp2_from_corr_wx
and l_enable_relaxed_clipping to have opposite values (one must be true
and the other must be false). In this commit, both are set to true, so
the code will produce an exception.

I am indenting the portion of the code where the advance subroutines
are located within the new ordering loop.

Temporarily commenting out the idiot proofing in order to run some tests ...
The results from this branch are still bit-for-bit with the master branch.

Now official reinstating the idiot-proofing and turning off the
l_enable_relaxed_clipping flag. This commit is BIT_CHANGING

I am committing some idiot proofing in regards to the advance
subroutines ordering. No index can have a value of less than 1,
greater than 4, and no index can have the same value as any other
index. Each adv routine order index must have a unique value.