Enable the compilation and execution of the tests under regress/

Compiling with warnings and certain compiler flags is important for security and bug-free code. Set a bunch of warnings via AM_CFLAGS in a common Makefile, and let those values propagate to all other Makefiles. While here, also fix the version string to remove quotes.

If UUID libraries are already detected, don't ignore them by then checking pkg-config, etc. Noticed by Christian "naddy" Weisgerber.

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

This commit introduces the 'make tests' target which will run the cmdline/* tests.

Follow the same version as got itself.

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

When checking for ncurses, only check against the widechar version of the library, otherwise the code won't work correctly, despite it compiling properly. Helped by Thomas Dickey.

This commit modifies the GoT main branch to be able to compile it under linux.