Enhance debugging of custom steps

Change-Id: Ie7f3346865c001401f2c1b301c6c0382c1d52b08
logviewer: fix 2 issues

- autoscroll did not work with wrapped line: dont wrap lines, and use scroll
- log viewer did not display one-liners

Change-Id: Iee935165615bc6af89b2cc9a4950d9f13884e90b
Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>
build page: enhance the previous build next build links

Those links are now utf-8 arrows, only displayed when they make sense

Change-Id: I98e2af02137f2102e05ec2cb5eca2dfe2c1012fd
in case of unknown build, go back until we find an existing build

Change-Id: Ia27f5e030a90a69205943f2d5243f1866458cce7
Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>
fix buildrequest route

Change-Id: I318a71fdf40fc885e75ff7d971932f8174a6e9f1
Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>