fix: allow negative weights for poly.lib::lcm
chg: readability
add: classifyci.lib
chg: start preparing doc for 3-1-7, add schubert.lib, fix schubert.lib
fix: add rp in ordering description
fix: mistake when given single row matrix
chg: moved listOfFacets to bbcone.cc where it belongs
chg: various new features

added features for tropical geometry (req by andreas):
- tropical variety of a polynomial
- common refinement of two polyhedral fans
- Polymake::vertexAdjacencyGraph
- Polymake::vertexEdgeGraph

also added various features for polytopes which were already available for cones, changed documentation accordingly
Merge pull request #346 from YueRen/gfanlib

Gfanlib
fix: by gpfister: extractZ
chg: 3-1-7
fix: removed fix path for xv
fix: typo
fix: version number 3-1-7
fix: gfan changes
removed factror.lib: tr 498
merge