The program will be installed as bintrans, uuencode, uudecode,
b64encode, and b64decode and will be responsible for running the coders
according to their historical behavior.

Additionally, bintrans will be able to take a parameter designating
the coder and accept all its options in this form:
bintrans <coder> [options]
and the behavior should be the same as if
<coder> [options]
was invoked.
This has the advantage that adding coders won't require installing them
as binaries.

Move uudecode files to uuencode since the latter is the one that
provides the manual page.

Reviewed by:	delphij (previous version)
Differential Revision:	https://reviews.freebsd.org/D32943

`SUBDIR.${MK_TESTS}+= tests` idiom.

This is a follow up to r321912.

directories to SUBDIR.${MK_TESTS} idiom

This is being done to pave the way for future work (and homogenity) in
^/projects/make-check-sandbox .

No functional change intended.

MFC after:	1 weeks

from the latter.

and finish the job. ncurses is now the only Makefile in the tree that
uses it since it wasn't a simple mechanical change, and will be
addressed in a future commit.

I'm starting with the easy cases.  The leftovers need to be looked at a
bit more closely.

Note that this change _does_ modify the code of the old tests.  This is
required in order to allow the code to locate the data files in the
source directory instead of the current directory, because Kyua
automatically changes the latter to a temporary directory.

Also note that at least one test is known to be broken here.  Actually,
the test is not really broken: it's marked as a TODO but unfortunately
Kyua's TAP parser currently does not understand that.  Will have to be
fixed separately.

Also add some missing $FreeBSD$ to keep svn happy.

OK'ed by:	core

any fake value.

respectively, for convenience when encoding or decoding base64 files.

As requested by various users.