Merged first batch of 1.51 changes for Boost.Graph and Boost.PropertyMap

svn path=/branches/release/libs/date_time/; revision=79189
Second batch of Boost.Graph and Boost.PropertyMap changes for 1.51

svn path=/branches/release/boost/date_time.hpp; revision=79191
Merge 1.51 initialisation to release.

svn path=/branches/release/boost/date_time.hpp; revision=79236
Merged more changes (bug fixes, especially hopefully fixing the VC++ test failure) from trunk

svn path=/branches/release/libs/date_time/; revision=79390
Merged bug fix from trunk

svn path=/branches/release/libs/date_time/; revision=79393
Hash: Merge using SFINAE to avoid implicit casts.

svn path=/branches/release/libs/date_time/; revision=79394
Merge changes from trunk:

Fix PDF install rule so that it's explicit and automatically invokes a PDF build when specified on the command line.
So "bjam pdfinstall" will now build and install the PDF to the current directory.
This works around some problems that the previous versions had if the user did not have an FO processor installed (basically Daniel James was unable to build the HTML docs for the distribution if the pdfinstall rule was implicit).

svn path=/branches/release/libs/date_time/; revision=79500
merge [79461], [79465], and [79485] from trunk

svn path=/branches/release/boost/date_time/; revision=79526
Merge greg_year serialization changes to release; fixes #3633

svn path=/branches/release/libs/date_time/; revision=79539
Hash: Merge update c++11 header macros.

svn path=/branches/release/boost/date_time/; revision=79544
Unordered: Merge some of the older changes from trunk.

Code reorganization, simpler tests, better use of Boost.Move.

svn path=/branches/release/libs/date_time/; revision=79545
Unordered: Merge updated c++11 config macros.

svn path=/branches/release/boost/date_time.hpp; revision=79546
Unordered: Merge allocator fix + improved tests. Fixes #7100.

svn path=/branches/release/boost/date_time.hpp; revision=79547
Hash: Merge support for smart pointers.

svn path=/branches/release/boost/date_time.hpp; revision=79548
merge [76766] from trunk to release

svn path=/branches/release/boost/date_time/; revision=79614
Wave: merging from trunk

svn path=/branches/release/boost/date_time.hpp; revision=79689
doc tweaks only; merge [79703] from trunk

svn path=/branches/release/boost/date_time/; revision=79704
markup failures, merge [79707] from trunk

svn path=/branches/release/boost/date_time/; revision=79708
Merge program_options revisions 79280 and 79283.

svn path=/branches/release/boost/date_time/; revision=79758
Merged r79227 from trunk, hopefully fixing all VC++ Boost.Graph Graphviz test issues

svn path=/branches/release/libs/date_time/; revision=79771