Initial commit of Rtcl 1.0. Based on Rtcl 0.3 by Neil McKay.

This version of Rtcl has been updated to work with Tcl 8.6.8 and
embeds R 3.4.4 as per the current R manual "Writing R Extensions." It
has also been repacked using the latest Tcl TEA package
layout. Currently being developed on FreeBSD 11.1 amd64.

Changes include:

- New namespace ::rtcl

- New "source" command equivalent to R's native method

- Renames commands "getval" and "type" to "getvalue" and "gettype",
  respectively

- Errors now passed through calling Tcl interpreter vs. static interp

- New unit tests via tcltest

- New R detection scheme in configure.ac

- Updated man page, README, etc.

ChangeLog

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+2018-04-13  Matt Adams  <matt.adams@radicaldynamic.com>
+
+	* rtcl.c: New Rtcl 1.0 version compatible with Tcl 8.6.8 and R
+	3.4.4 based on previous work by Neil McKay. Introduces ::rtcl
+	namespace, new "source" command, renames "getval" command to
+	"getvalue", renames "type" command to "gettype". Embeds R as per
+	current R manual "Writing R Extensions" and handles error in same
+	Tcl interpreter vs. static interp used in previous
+	versions. Includes Tcl unit tests.
+
+See LICENSE for copyright & permission notice.

LICENSE

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+This software is copyrighted by the Neil McKay, Matt Adams, and other
+parties.  The following terms apply to all files associated with the
+software unless explicitly disclaimed in individual files.
+
+The authors hereby grant permission to use, copy, modify, distribute,
+and license this software and its documentation for any purpose, provided
+that existing copyright notices are retained in all copies and that this
+notice is included verbatim in any distributions. No written agreement,
+license, or royalty fee is required for any of the authorized uses.
+Modifications to this software may be copyrighted by their authors
+and need not follow the licensing terms described here, provided that
+the new terms are clearly indicated on the first page of each file where
+they apply.
+
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+FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
+DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
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+NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
+MODIFICATIONS.
+
+GOVERNMENT USE: If you are acquiring this software on behalf of the
+U.S. government, the Government shall have only "Restricted Rights"
+in the software and related documentation as defined in the Federal 
+Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2).  If you
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+252.227-7013 (c) (1) of DFARs.  Notwithstanding the foregoing, the
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+permission to use and distribute the software in accordance with the
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