align --help and support -h
align --help and support -h

Summary:
Make `infer -h` behave the same as `--help`, document it, and finally align the
`--help` and `--help-full` options with the other options in the help output
(they are added separately from the other options so this wasn't the case
before).

Reviewed By: jberdine

Differential Revision: D3741778

fbshipit-source-id: a0c81ba

blzq/infer,ropas/infer,kageiit/infer,xennygrimmato/infer,jvillard/infer,facebook/infer,ropas/infer,xennygrimmato/infer,facebook/infer,jsachs/infer,blzq/infer,jvillard/infer,blzq/infer,facebook/infer,xennygrimmato/infer,facebook/infer,kageiit/infer,jsachs/infer,jsachs/infer,xennygrimmato/infer,ryoon/infer,jvillard/infer,xennygrimmato/infer,facebook/infer,ryoon/infer,jsachs/infer,kageiit/infer,ryoon/infer,kageiit/infer,jvillard/infer,facebook/infer,ropas/infer,jvillard/infer,facebook/infer,kageiit/infer,kageiit/infer,ropas/infer,kageiit/infer,ryoon/infer,ropas/infer,jvillard/infer,ropas/infer,ryoon/infer,blzq/infer,jvillard/infer,jsachs/infer,blzq/infer,xennygrimmato/infer,xennygrimmato/infer,blzq/infer,jsachs/infer,ryoon/infer