Merge pull request #6 from pdehaye/master

Paul-Olivier Dehaye templates, minor typos, consistency of macros
Added Sheffield, Southhampton, Simula, minor improvements to the picture TODO
Finished adding latest participants
Updated PIC instructions
Added / implemented two comments by William + fixed two crossrefs
Improvements to the Interfaces between systems task
Add CV and extra informations for Pythran
update C Pernet's CV
Merge
Merge branch 'master' of https://github.com/sagemath/grant-europe
slight update on Grenoble site
Split of the impact section in a separate file for easier edition + comments by William
Added deliverable for ticket creation
Threw in two little ideas for the Social Aspects WP
Comments by William
Comments by William
Updated pdf
added remarks on GAP-Singular collaboration
minor changes
corrected typo
More links for objectives to aims