Fixes regression introduced by commit 41f061b2f459318f3738f59d7676efccc4beb344 where tracked files inside an ignored directory were reported as missing.

This is important in cases like 'got diff file.txt file.txt' which should only show the diff for file.txt once. suggested by kn@

Found by our cherrypick regression tests.

Annoying bug which we inherited from OpenRCS which inherited it from OpenBSD's diff3 program. ok tracey millert

Cache commit timestamps in struct got_reference in case we are sorting references by commit timestamp. This avoids opening and closing commits every time we compare two references with each other. ok thomas.adam

Need for filtering by path sugggested by kn@ ok naddy@

ok millert@

Potentially this function could return objects of a type that was not requested. Problem found by code inspection. This change does not affect any of our existing tests.

OK stsp

Update configure.ac and CHANGELOG for 0.61

When building the dist tarball, include its man page.

On a __GLIBC__ system, we need to use __xpg_strerror_r() -- this is already checked for, so simply one of these checks to reduce code changes from upstream.

In order to portably handle the difference in how 'sed -i' works between *BSD and Linux, provide a wrapper to invoke the underying system sed(1) based on which OSTYPE is in use.

To minimise the amount of churn between the difference in date(1) and ln(n) semantics, use gdate and gln from coreutils.

Enable the compilation and execution of the tests under regress/

Allow for warnings via AM_CFLAGS in a common Makefile, and let those values propagate to all other Makefiles. Currently the more useful checks are disabled until upstream changes are made to reduce warnings. While here, also fix the version string to remove quotes.

Based on a patch by Omar Polo