Some tweaks to make corporate roaming users Happy

[RaphRi]

Hi, from yopla on freenode irc.
As requested, I file a bug to things that need some thinking.

Goal is to store config file and folders in Windows %appdata% instead of %localdata% So that roaming users (multiple users can login on mutiiple different machines) dont have to configure their sync folder each time, and sync some folder to their private shared directory.

Tricky thing is to make some check to avoid conflicts

• same user could have open multiple sessions on different computers which could be bad thing if they point on same shared private folder. (We try to prevent this but it is still possible)
• make sure a bad configuration (some folder missing or old ones) doesn't delete files server side.

Thank you for your help

[RaphRi]

OK, I've cloned Mirall and had a look in it.

First Idea : add a member lock filename in Folder Class.
some more check in Folder::SetSyncEnabled
If true
create lock filename in network folder (to be excluded from sync) only if not exists
if lock filename already exists don't enable.

if false
delete lock filename

Check correct behaviour of "enable sync" Buttons (green/yellow).

Sort of simple way to have only each network folder syncing once.

[guruz]

Related #684

[dragotin]

Lets get more specific in #684