Replace is_deleted by a more generic path_status function

This should allow us to use the same function to get other statuses than
deleted / allowed.
Rename the os_deleted_fs variable to os_fsmap

This makes it more clear that the fsmap can store other statuses than
deleted / allowed.
Add an fs.direct profile option

The paths defined as fs.direct are accessed directly without sandboxing.
Use '/' fsmap key as the default value
Make an error if an incorrect path is used in a profile
Simplify: if *del == ' ', it cannot be '\0'
profile parsing: skip whitespaces at begining of lines
profile parsing: use strbeg rather than strstr

Now that we are skipping whitespaces at begining of lines, we can use
strbeg.
Allow filtering network connections