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

positive feedback from Omar and kn ok kn

OK stsp

The root Makefile does not hook into lib/ via <bsd.subdir.mk> since it is not a program itself and thus gets included by all others. This means `make tags` skips lib/ and `make -C lib/ tags` does not know what to do; provide a minimal <bsd.lib.mk> stub and hook it up just for the "tags" such that *all* source is browsable via tags. See /usr/share/mk/bsd.README for details. Feedback stsp tb OK tb

ok naddy

Problem reported by naddy. ok naddy

Complete 95f394e8917def2c11ce292b3a8f804d261b1d12; reminder to look at gotadmin(1) from stsp, thanks.

ok jrick

This has the advantage of tags being located right by the full command; combined with tags ":tco" to search for the `co` alias will jump right to the `checkout` line, neatly showing everything without needing further navigation. tmux hint from Thomas Adam, thanks. OK stsp