No implicit <Directory> entry for ScriptAlias path

Support for ScriptAlias currently implicitly and automatically creates
<Directory> configuration directives for the path component in a given
ScriptAlias directive. These are not useful or needed, according to the
mod_alias documentation. Fixes issue #486.

This change also indirectly relates to #487 because the implicitly
created <Directory> entry for each ScriptAlias path also had
`SSLOptions +StdEnvVars` set for that directory.
Merge pull request #488 from antaflos/no_directory_for_scriptalias

No implicit <Directory> entry for ScriptAlias path
Set SSLOptions StdEnvVars in server context

We set `SSLOptions` now in server context and we set it to `StdEnvVars`.
Thus, we no longer need the <FilesMatch > in server context to set it
for php, CGI and SSI applications.
We allow it to be overridden by the `apache::mod::ssl` class parameter
`ssl_options`. Further, we allow it to be overridden in directory
context.
Documentation for all of these has been extended and tests have been
adapted to make sense in this new context. This commit fixes #487