Fixes  #157
Update links in INSTALL
Release Jelix 1.6.0
Bumped version to 1.6.1pre
Fix: jException kept only the first line on multiline messages
Fixed version number
Fix: jException kept only the first line on multiline messages - bis
Build: try to fix git shortlog execution on some environment
Build: try to fix git shortlog execution on some environment #2
Build: fix git command execution on some environment
Build: fix current path after running zip
Merge branch 'jelix-1.3.x' into jelix-1.4.x
Merge branch 'jelix-1.4.x' into jelix-1.5.x

Conflicts:
	build/buildapp.php
	build/buildfonts.php
	build/buildjbt.php
	build/buildjelix.php
	build/buildjtpl.php
	build/buildmodules.php
Merge branch 'jelix-1.5.x' into jelix-1.6.x