Include inttypes.h instead of stdint.h (fixes
issue299)
Many projects use inttypes.h, too. stdint.h isn't available everywhere, e.g.
on some versions of Solaris, while inttypes.h is available everywhere where
stdint.h is.
Fix new tests to be better. In particular, fix webraw test to
specify a date on commit to be less brittle, and fix test-oldcgi to test
fetching a subdirectory of a webdir instance.