Add support for modular build structure. (#114)

* Make the library modular usable.

* Switch to library requirements instead of source. As source puts extra source in install targets.

* Add requires-b2 check to top-level build file.

* Bump B2 require to 5.2

* Change all <source> references to <library>.

* Update copyright dates.

* Move inter-lib dependencies to a project variable and into the build targets.

* Update build deps.

build.jam

@@ -0,0 +1,32 @@
+# Copyright René Ferdinand Rivera Morell 2023-2024
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+require-b2 5.2 ;
+
+constant boost_dependencies :
+    /boost/config//boost_config
+    /boost/core//boost_core
+    /boost/function//boost_function
+    /boost/fusion//boost_fusion
+    /boost/mp11//boost_mp11
+    /boost/mpl//boost_mpl
+    /boost/optional//boost_optional
+    /boost/preprocessor//boost_preprocessor
+    /boost/type_traits//boost_type_traits
+    /boost/utility//boost_utility ;
+
+project /boost/parameter
+    : common-requirements
+        <include>include
+    ;
+
+explicit
+    [ alias boost_parameter : : : : <library>$(boost_dependencies) ]
+    [ alias all : boost_parameter test ]
+    ;
+
+call-if : boost-library parameter
+    ;
+

test/Jamfile.v2

@@ -11,7 +11,8 @@ import testing ;
 
 project
     :
-        default-build
+        requirements
+        <library>/boost/parameter//boost_parameter
         <warnings>off
         <include>.
     ;
@@ -304,6 +305,7 @@ alias parameter_literate_tests
         :
             <define>BOOST_PARAMETER_MAX_ARITY=5
             <define>BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY=6
+            <library>/boost/graph//boost_graph
         :
         :
             <preserve-target-tests>off
@@ -426,6 +428,7 @@ alias parameter_literate_tests
         :
             <define>BOOST_PARAMETER_MAX_ARITY=5
             <define>BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY=6
+            <library>/boost/graph//boost_graph
         :
         :
             <preserve-target-tests>off