npm should use Local AppData not Roaming AppData for globally installed modules

[Daniel15]

Windows has two different types of AppData directories:

• %APPDATA% (eg. C:\Users\Daniel\AppData\Roaming\) - Contains user settings. In a corporate/domain environment, this can be configured to be synchronised across computers, so it should generally only hold things you'd actually need to keep in sync. Settings/config is a good example.
• %LOCALAPPDATA% (eg. C:\Users\Daniel\AppData\Local\) - Contains other random junk. It's like AppData except for stuff that wouldn't need to be kept in sync across machines. Per-user temporary files and local caches fall into this category.

npm places globally installed modules in the roaming directory, but it should really use the local one.

[kenany]

See #4564