Dashboard: Panel error are less intrusive, panel error bar replaced with small indicator, hover for short details, click to open inspector, Closes #681

- a complete fix with a consistent support of alias in all use cases is not obvious (see #660 for explanations)

Chart: Possible fix for stuck tooltip (annotation or time series point hover tooltip would not disappear), Fixes #450

Dashboard schema simplifications, moved schema updates to dashboard model creation, removes irritating 'unsaved changes' dialogs that show for dashboard schema changes, Closes #532

Fix for InfluxDB temp dashboards, seperate series name prefix so they do not show up in dashboard search, #633

Refactoring temp dashboard settings, and handling, moved from dashboard to config.js, defaults are enabled, and ttl of 30 days, #641, #638

Graphite: Fix for graphite expressions parser failure when metric expressions starts with curly brace segment, Fixes #528

Filtering: Fix for nested filters, changing a child filter could result in infinite recursion in some cases, Fixes #628

added saving and showing temp searches also trailing comman in default.json was causing the default to fail to load for me, #633

cleanup of 'loader' settings, removed loader.save_elasticsearch, loader.load_elasticsearch. Save/Load is default enabled and will use any datasource marked with grafanaDB: true property

Changed opentsdb metric option chartLabel to Alias to better conform to grafana naming, updated changelog with PR #618 info

Changed dashboard urls from /dashboard/elasticsearch/<title> to dashboard/db/<title>, old urls will still work