* dashboard menu: fix overlap by singlestat and panel link icon

* refactor: navbar z-index

* hide grafana icon in solo panel mode

Added border radius and tightened up the folder boxes. Still needs to have the bottom margin expanded to 8px when in opened state (this needs @torkelo)

* grid: fix small panels migration and make panel height closer to row height

* grid: migrate rows

* grid: increase min panel height

* grid: fix panel placement for complex layouts

* dashboard migration: refactor

* dashboard migration: add tests for grid layout

* dashboard: fix complex layout migration

* dashboard migration fix: fill current row if it possible

* test: fix karma tests by setting default panel span

* dashboard: fix migration when panel height more than row height

* dashboard: fix migration for collapsed rows

* grid: add all rows if even one collapsed or titled row is present