-added some common package attributes to amqp msg body

-added contnet-type/encoding to amqp msg

-better error on resource fail

-added get_package_from_handle

added missing include in RezPipInstall.cmake

-added 'setuptools' and 'pip' installer packages

- REZ_XXX_MAJOR_VERSION now exported in build env, as well as MINOR, PATCH
- added new cmake macro RezPipInstall, can install python module from url

-added prefix_char override for suite tools

-can set on per-context basis
-setting prefix_char to '' suppresses all '+'-like options
-added another logger for debugging memcached use

-minor update to default physical/logical cores to 1 if there are any…

… probs at all

-fix for subtle problem where 2 studios are sharing pkgs and have mir…

…rored pkg paths, but one is symlinked.

version up

-added rez-env --build option

-version up