Rethink repr usage

[jarekwg]

I've written the __repr__ methods in a way that makes it super quick to know what methods are available on a manager. However, when looking at a list of companyfiles, you end up getting something like this:

[CompanyFile:
     contacts
     general_ledger
     inventory
     invoices
     purchase_bills
     purchase_orders,
CompanyFile:
     contacts
     general_ledger
     inventory
     invoices
     purchase_bills
     purchase_orders]

This obviously (a) looks silly, and (b) provides no insight as to what each companyfile is. Should at the very least include the name and uid of the companyfile, and also consider moving the method list to a separate methods() function rather than having the repr list available endpoints.