-Werror fixes
autoreconf is the 'official' way to get automake & friends updated.
Build: Error on any gcc warnings.  Yes, it makes life a bit more painful,
but keeps the codebase cleaner.
enable ALDOR_ERROR_ON_WARN

when peter's build fixes are merged in, this will work
Merge remote-tracking branch 'origin/pab/build-fixes-2'
fix autogen: install missing build files automatically
conditionalise -Werror with ./configure --enable-werror
ignore libtool.m4, as well