Squashed 'sglib/' changes from 0ec7b66..4d3ac10

4d3ac10 applied a proposed fix to apply_boundary_conditions_solution
d254eaa Added an error message to multiindex...
b4b5d18 Removed math utilities from util to mathutil
6f2db34 Added and updated almost all Contents.m files
5fe89bd added pushdirect option to sglib-subtree
1701380 Update unittest for compute_pce_matrix (better coverage)
d011745 Huge cleanup and moving into packages sfem and pce.
df15bfb Changed funcall unittest to be independent of current format options.

git-subtree-dir: sglib
git-subtree-split: 4d3ac10f84f520a1046c5ecdf3daf285ff2f7f44
Merge commit '1d34522d07d666a0e1bae1308ab8c41bdfa0a319'