Ensure Solution Vector Equality before first solve

[friedmud]

All solution vectors (current, old and older) must hold exactly the same values before the first solve. So if any initial adaptivity with reprojection (or whatever else) was done we need to be sure all the vectors are the same....

[andrsd]

I moved the block that does initial adaptivity before copySolutionBackward(). It does not affect any application. Attaching a patch for review, if it is what we want to do...

[aeslaughter]

In 1d0c6cf:

Applied the patch attached to ticket 1396:
Initial adaptivity happens before copy solution backwards (closes #1396)
Added test to check for initial solution equality