hack-handler-simpleserver is presumably quite a bit easier to install than
happstack, and so far fits hledger's needs just as well, so it is now the
default when installing with -fweb. To build with happstack, use
-fwebhappstack instead. hledger --version shows which webserver was
built. Also webserver thread management has been simplified so should be
more consistent across platforms.
Until now, all unit tests were defined in Tests.hs. Pro: simple, makes
code/test line counting easy. Con: tests are far from code, Tests.hs turns
into a big wall of test code. Now, unit tests can also be defined in modules.
To avoid name clashes and template haskell complexity, a dumb manual
naming scheme is used: any module may export a hunit Test(List) named
tests_ModuleName. These are manually aggregated and re-exported when
appropriate, eg in Commands.All and finally in Tests.hs.
