Barebones offline installation support

return red border around invalid form fields

addresses  #111

The 0-width border in this theme prevented the red error border from showing. This commit returns a 1px solid border with the same CSS selector as PVE's built-in theme and corrects for the corresponding layout disruption by adding a -1px margin. The built-in theme currently sets the border color to #cf4c35, which is not overridden.

Fix bottom/top scrollers (fix #113)

Merge from next

Fix pkgversions window and md codeblocks

Change contrast & update serve.py

Added umask

Some people use umask 077 (like me), and it doesn't seem to work. I tried with umask 022 and it worked just fine, so I think we should set the default umask in the script. It would be nice if we can figure out something stricter than 022 as well.

Status command uses silent mode exit codes at all times.

Fixes #91

Take in changes from next to master

Change warning row background color (closes #82)

Add root check

* 7.0: Fix left-panel DC view context menu
* 7.0: Remove chart button borders
* 7.0: Fix change button focus color
* 7.0: Color icons
* 7.0: Fix grid group title color for repo page
* 7.0: Checkbox: Inherit color
* 7.0 changes compiled
* Add 7.0 to supported list