Add support for upstream's tag signing commits, but adding the relevant files to autotools, and making those portable-compatible.

Make worktree_open part of the build.

Update portable to support changes for bloom, etc.

When building the dist tarball, include its man page.

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.

libexecdir should be used over bindir. Noticed by Christian "naddy" Weisgerber

Add gotadmin to configure.ac, etc., so it can be built and installed. OK thomas.adam

libexec is a common path which is understood by autotools, and should be honoured. Patch from Christian "naddy" Weisgerber

This adds the capability to compile got-portable on FreeBSD.

Rather than having a toplevel EXTRA_DIST target in the toplevel Makefile.am file, move the relevant files to their own Makefile.am locations.

Add gotadmin to configure.ac, etc., so it can be built and installed. OK thomas.adam