Make it possible to delete targets

Signed-off-by: Henrik Saari <henrik.saari@jollamobile.com>
Updated package list update function to mirror sdk-manage script output

Signed-off-by: Tom Swindell <t.swindell@rubyx.co.uk>
Fixed output message when removing target

Signed-off-by: Tom Swindell <t.swindell@rubyx.co.uk>
Added button to force target synchronisation

Signed-off-by: Tom Swindell <t.swindell@rubyx.co.uk>
Debugging view.
Merge https://github.com/mer-tools/sdk-webapp
Working force-timeout of sudo-ed processes.
Smart buttons in toolchains management page.