Remove core from combined documentation.

They want it to be standalone.

doc/Jamfile.v2

@@ -42,8 +42,6 @@ boostbook doc
     <dependency>../libs/accumulators/doc//accumulators
     <dependency>../libs/circular_buffer/doc//standalone/<format>docbook
     <dependency>../libs/lexical_cast/doc//lexical_cast
-    <dependency>../libs/core/doc//core
-    <dependency>../libs/core/doc//ref_reference
     <dependency>../libs/chrono/doc//chrono
     <dependency>../libs/program_options/doc//autodoc.xml
     <dependency>../libs/algorithm/string/doc//autodoc.xml
@@ -95,7 +93,6 @@ boostbook doc
     <implicit-dependency>../libs/accumulators/doc//accumulators
     <implicit-dependency>../libs/chrono/doc//chrono
     <implicit-dependency>../libs/lexical_cast/doc//lexical_cast
-    <implicit-dependency>../libs/core/doc//core
     <implicit-dependency>../libs/functional/hash/doc//hash
     #<implicit-dependency>../libs/type_traits/doc//type_traits
     <implicit-dependency>../libs/static_assert/doc//static_assert

doc/src/boost.xml

@@ -200,8 +200,6 @@
      </libraryinfo>
    </library>
 
-   <xi:include href="core.xml"/>
-
    <library name="CRC" dirname="crc" html-only="1">
      <libraryinfo>
        <author>