Added Alex's extension for sheet 3
first exercise on sheet 5
updated first exercise on sheet 5
Create folder dag2013-cecilia with polymake extension
Include direct_sum.cc in the proper folder
Merge pull request #18 from cgiron/master

cgiron: Sheet 3, Software exercise 1
Merge remote-tracking branch 'origin/master' into exercises
Merge remote-tracking branch 'upstream/master'
minor edit
second exercise, sheet 5
Added Alex's solution for sheet 2 and the code for sheet 3
Added lecture 5
Added lecture 5
Added Alex's extension for sheet 3
merged lecture 5
Merge remote-tracking branch 'upstream/master'
Changes made in the determinant code
More changes made in the determinant code
Changes in the polytopality range finder code
work on exercise 2