Added `-d` short option to `--verbose` (see ceylon/ceylon-compiler#1440)
Added support for using `-v` as a short name for `--version` (see ceylon/ceylon-compiler#1440)
Fixed problem where `-h` wasn't available as a short alternative for `--help` in all cases (see ceylon/ceylon-compiler#1440)
Fixed documentation rendering of optional arguments that have short names (see ceylon/ceylon-compiler#1440)
Don't threat optional arguments with short names as an error anymore but as if they were NOT_ALLOWED (ceylon/ceylon-compiler#1440)
Allow `@Option` to have a short name even when `@OptionArgument` also exists (ceylon/ceylon-compiler#1440)