Add classes to uni/lib that implement fixed point arithmetic.

If operator overloading is configured the classes will support it. Otherwise, the
alternative methods (add, sub etc.) can be used in place of the infix operators.
Test code is in tests/unicon. There are two sets of tests, one with overloading and
one without (one is a superset of the other).
Unidoc documentation is embedded in the source code.

tests/Makefile

@@ -5,7 +5,7 @@ E=/bin/echo
 # define UC if it is not defined already
 UC?=../bin/unicon
 
-TESTS=general posix thread pattern mt
+TESTS=general posix thread pattern mt unicon
 
 #  The default is to run all tests, using icont.
 

tests/unicon/FxPtTest.icn

@@ -0,0 +1,20 @@
+#################################################################################
+#
+# This file is released under the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE
+# (LGPL) version 2. The licence may be found in the root directory of the Unicon
+# source directory in the file COPYING.
+#
+# Fixed Point Arithmetic class tests (without operator overloading)
+# --------------------------------------------------------------------------------
+
+procedure main(args)
+   if not(&features == "large integers") then
+      stop("large integers not supported")
+
+   runTests(args)
+end
+
+# Turn off operator overloading
+$undef _OVLD
+$include "FxPtTests.icn"
+

tests/unicon/FxPtTest_OVLD.icn

@@ -0,0 +1,21 @@
+#################################################################################
+#
+# This file is released under the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE
+# (LGPL) version 2. The licence may be found in the root directory of the Unicon
+# source directory in the file COPYING.
+#
+# Fixed Point Arithmetic class tests (with operator overloading)
+# --------------------------------------------------------------------------------
+
+procedure main(args)
+   if not(&features == "large integers") then
+      stop("large integers not supported")
+
+   if not (&features == "operator overloading") then
+       stop("operator overloading not supported")
+
+   runTests(args)
+end
+
+$include "FxPtTests.icn"
+

tests/unicon/Makefile

@@ -0,0 +1,21 @@
+
+include ../Makedefs
+
+TARGETS=$(patsubst %.icn,%,$(wildcard *.icn))
+
+SKIP= tester FxPtTests\
+      audio dbi list_test nlm q rec test testnlm clin_err hello mintest ovld q2 sel to
+
+Test: DoTest
+
+include ../Makefile.test
+
+FxPtTest: FxPtTest.icn tester.u
+
+FxPtTest_OVLD: FxPtTest_OVLD.icn tester.u
+
+tester.u: tester.icn
+	$(UC) -s -u -c $^
+
+
+

tests/unicon/stand/FxPtTest.std

@@ -0,0 +1,4 @@
+--------------------------------------------------
+          Fixed Point Tests Start
+          Fixed Point Tests Passed = 454 Failed = 0
+--------------------------------------------------

tests/unicon/stand/FxPtTest_OVLD.std

@@ -0,0 +1,4 @@
+--------------------------------------------------
+          Fixed Point Tests Start
+          Fixed Point Tests Passed = 586 Failed = 0
+--------------------------------------------------