Admin Info Screen: Display if plugin assets directory is writable (#2425).
Merged r2116, r2117 and r2187 from trunk.
Merged r2164 to r2167, r2188 and r2189 from trunk.
Merged r2212 to r2214 from trunk.
Do not escape back_url twice when login fails.
Changes pt-br decimal separator (#1372).
Stricter textile links parsing (#2417).
Import custom fields values from emails (#2413).
Jump to the current tab when using the project quick-jump combo (#2364).
Increment project files downloads.
