restrict visibility of vevs
name tree-level ewsb eqs. according to Higgs boson
eliminate use of VEVs in the Higgs--EWSB eq. association function
renaming function name in the test modules
rename parameter
catch case where the VEV list contains an extra phase
associate Higgs <-> EWSB eq. according to sigma and phi
Merge branch 'bugfix-vev-number' into development