Added more specializations for get_num_bits.

svn path=/trunk/libs/gil/; revision=82882
packed_channel_value is now using low_bits_mask_t to reduce code.

svn path=/trunk/boost/gil/; revision=82883
Replacing io extension.

svn path=/trunk/boost/gil/; revision=82980
Adding new io extension.

svn path=/trunk/boost/gil/; revision=82981
Adding io extension test suite and documentation.

svn path=/trunk/libs/gil/; revision=82982
Fixed incorrect header.

svn path=/trunk/boost/gil/; revision=82983
Added more information to readme.txt.

svn path=/trunk/libs/gil/; revision=82984
Fixed incorrect header include.

svn path=/trunk/libs/gil/; revision=82985
fixed incorrect format of test.bmp.

svn path=/trunk/libs/gil/; revision=82987
Fixed scanline_read_iterator interface.

svn path=/trunk/boost/gil/; revision=82988
Adopted test code and documentation to scanline_read_iterator interface changes.

svn path=/trunk/libs/gil/; revision=82990
Only increase the position inside operator++.

svn path=/trunk/boost/gil/; revision=82991
Added difference_type to scanline_read_iterator.

svn path=/trunk/boost/gil/; revision=82992
bug fix with scanline_read_iterator. Now reads and skips should happen at the correct call.

svn path=/trunk/boost/gil/; revision=83043
changes to scanline_read_iterator.

svn path=/trunk/boost/gil/; revision=83075
changes to scanline_read_iterator.

svn path=/trunk/libs/gil/; revision=83076
#4517

svn path=/trunk/libs/gil/; revision=83107
Using iterator_facade as base for scanline_read_iterator.

svn path=/trunk/boost/gil/; revision=83141
Updated scanline_read_iterator code sample.

svn path=/trunk/libs/gil/; revision=83144
Fixed incorrect syntax.

svn path=/trunk/libs/gil/; revision=83145