Add hints about what data goes into the variable

It's not immediately obvious what all can be accessed from the register
variable. Breadcrumbs to use -v would help.
If a executable is defined but not found the module should fail. Addresses https://github.com/ansible/ansible/issues/5781.
Add move_home option to user module
Merge pull request #5821 from risaacson/issue5781

If a executable is defined but not found the module should fail.
Merge branch 'devel' of https://github.com/aclindsa/ansible into aclindsa-devel
Merge pull request #5759 from j2sol/register-hints

Add hints about what data goes into the variable
Add support for --copy-links

indentation fix