Default perms check

[durack1]

The default group is currently climate, we should wash so that xclim is the new group for all subdirs and files.

All machines will need to inherit the groups and user/uid tables

[durack1]

@pochedls is this solved, or does this need to be added?

[pochedls]

@durack1 - there is currently no functionality to deal with permissions

[durack1]

@pochedls I generated a standard function that washes directories and files with standard 755 rx and 644 r respectively, we could implement this if it's useful

https://github.com/PCMDI/input4MIPs-cmor-tables/blob/master/src/input4MIPsFuncs.py#L245-L268