Bugfix: std::cout needs <iostream>
updated paper to discuss issues with twoloop Higgs corrections a little more and to describe a change I *propose* we make.
small edit to first sentence of introduction to address point 1 from referee 2.
allow user to enable/disable specific Higgs 2-loop corrections
add default Higgs 2-loop corrections to SLHA files
shorten description of FlexibleSUSY block entry 11
correcting comment
initialize Higgs 2-loop correction struct
impelemt if-statements which select the Higgs 2-loop correctons
define abbreviations for Slavich 2-loop Higgs function names
replace original Higgs 2-loop function calls by readable abbreviations
adding exception class for failed diagonalization
update ChangeLog
Merge branch 'development' of https://github.com/FlexibleSUSY/FlexibleSUSY into development
Changed description of the two loop Higgs corrections in section 5 to match new plan which we agreed upon and Alex has implemented.  still need to fix later section.
Changed description of the two loop Higgs corrections in section 6.5 to match new plan which we agreed upon and Alex has implemented.
add new default FlexibleSUSY SLHA input options
Fix a typo in documentation of fs_svd()
Fix reordering of singular vectors of a non-square matrix

so that in the SVD, m == u * sigma * vh, sigma(i,j) == 0 if i != j.
Generalize documentation of SVD to rectangular matrices