misc clean-up

svn path=/branches/proto/v4/boost/phoenix/; revision=45291
simplification

svn path=/branches/proto/v4/boost/phoenix/; revision=45300
loop statements

svn path=/branches/proto/v4/boost/phoenix/; revision=45302
merged from trunk

svn path=/branches/proto/v4/libs/phoenix/; revision=45360
add switch statement

svn path=/branches/proto/v4/boost/phoenix/; revision=45455
minor simplification

svn path=/branches/proto/v4/boost/phoenix/; revision=45501
merged from trunk

svn path=/branches/proto/v4/boost/phoenix/; revision=45503
add throw_() and throw_(e)

svn path=/branches/proto/v4/boost/phoenix/; revision=45525
add try_ and catch_ statements

svn path=/branches/proto/v4/boost/phoenix/; revision=45532
phoenix::function, with TR1 result_of-style return type deduction (breaking change)

svn path=/branches/proto/v4/boost/phoenix/; revision=45569
increase mpl metafunction arity limit

svn path=/branches/proto/v4/libs/phoenix/; revision=45571
updated function test for TR1-style function objects

svn path=/branches/proto/v4/libs/phoenix/; revision=45592
phoenix::bind()

svn path=/branches/proto/v4/boost/phoenix/; revision=45618
add the various phoenix object utilities

svn path=/branches/proto/v4/boost/phoenix/; revision=45624
bind, casts, construct, new, delete hold child expressions by reference

svn path=/branches/proto/v4/boost/phoenix/; revision=45630
partially working let() and local_variable<> implementations

svn path=/branches/proto/v4/boost/phoenix/; revision=45687
better local_variable<> and let() implementation

svn path=/branches/proto/v4/boost/phoenix/; revision=45762
more powerful extensible grammar, proper grammar checking for local variables

svn path=/branches/proto/v4/boost/phoenix/; revision=45802
get statement tests passing on gcc

svn path=/branches/proto/v4/boost/phoenix/; revision=45810
get let() tests passing on gcc

svn path=/branches/proto/v4/boost/phoenix/; revision=45815