intermediate reduction

done when more than 10 mio candidates are collected
support hyperplanes computed in a seperated cone if needed
reducible generators survive
after first intermediate reduction, one after every evaluation
Merge branch 'master' into zwischenreduktion
intermediate reduction: reset candidates number
fix for volume computation

when using a unimodular mother the key was not adapted what lead to
incorrect results in non-homogenouse settings
version 2.10.1 with fix for volume computation
fix a missing Top_Cone-> befor evaluate_rec_pry
Merge branch 'zwischenreduktion' into bruns_rec_pyr
set pyramid buffer size back to 200k
Merge branch 'zwischenreduktion' into bruns_rec_pyr
distinction between large and small recursive pyramids

by W.Bruns
Recursive pyramids with more than 2.5*dim generators are considered
large and evaluated serially.
Merge branch 'master' into bruns_rec_pyr
set bound for large recursive pyramids to nr_gen > 4*dim
fix a missing Top_Cone-> befor evaluate_rec_pry
corrections for grading

in mode -s when support hyperplanes where supplied
Merge branch 'version2.10'

merge version 2.10.1 into master