(Bug 5219) Speed up 00-compile.t

I've tested this with all modules passing and also with my changes from bug
5212 backed out.  Works as expected and TONS FASTER.
Merge pull request #525 from kareila/bug5219-compiletest

(Bug 5219) Speed up 00-compile.t
(Bug 5219) Make sure the DW cgi-bin is in @INC

In my testing, this fixes the issue Dre pointed out where the test
would fail if the DW cgi-bin was not already in @INC (e.g. by
setting PERL5LIB in the shell, which is what I had done).
Merge pull request #526 from kareila/bug5219-compiletest

(Bug 5219) Make sure the DW cgi-bin is in @INC
(Bug 5221) Fix uninitialized value warning in DW::SiteScheme

Use of uninitialized value $rv in hash element
 at /dreamhack/home/8398-kareila/dw/cgi-bin/DW/SiteScheme.pm line 199.
Merge pull request #528 from kareila/5221-warnings

(Bug 5221) Fix uninitialized value warning in DW::SiteScheme