started to record and graph WAL volumes
rest of wal-monitoring changes
bugfix - returning 0MB for small xlog locations
HTML prettyfying.
Merge branch 'wal-volumes'
duplicate indexes info added to /perfindexes
hosts_json and groups_json had gotten lost somewhere
REST improvements + complete testdata generation
Added hard-coded menu.
Merge remote-tracking branch 'origin/master'
Added hard-coded menu.
moving 'perf menu' to bottom + restored WAL vol. column in /report
REST improvements, showing HostShortUiName in URLs
Merge branch 'master' of ssh://stash.zalando.net:7999/platform/pgobserver

Conflicts:
	frontend/templates/index.html
	frontend/templates/perf_api.html
	frontend/templates/sproc_detail.html
	frontend/templates/table.html
	frontend/templates/table_detail.html
	frontend/templates/tables_size_table.html
Fixed table size on tables overview page and "hacked" flot to always show the legend space on both sides.
New global $flot variable with all graphs so we can easily resize them. Added resize callback to graphs.
amount of test instances is configurable now + some more REST improvements
Added missing slidedown image.
Left align name column on tables view.
UI fixes for 'top sproc' columns layout