Merging r4132, r4134, r4143, r4183, r4191, r4199:

Merging r4132, r4134, r4143, r4183, r4191, r4199:

Various fixes related to error messages:

*) Removed old warning that suggested to use "server_name_in_redirect off"
   (now the default) in place of no longer supported "server_name *".

*) Fixing directive name in error message if types hash size is not enough.

*) Replaced "can not" with "cannot" and "could not" in a bunch of places.
   Fixed nearby grammar errors.

*) Overhauled error messages.