Developer Workflow Improvements

Developer workflow improvements as documented in the following bugzilla entry:

https://bugzilla.yoctoproject.org/show_bug.cgi?id=6662

Todo list

• Running recipetool from devtool within the SDK seems to be broken -- Fixed, was related to custom environment setup script not being used (as well as poor error reporting) - Paul
• Properly report failures in bitbake execution during install (output is currently discarded)
• Prevent do_rootfs itself from executing on install - we only need the tasks that it depends upon
• Modularise devtool -- In progress - Paul
• Write test script for SDK
• Randy: getting errors from bitbake about changed signatures - behaviour change after Hongxu's patch?
• Update environment setup script to use buildsystem toolchain -- Done but needs testing and function dependent on uninative - Randy
• Make relocation in toolchain-shar-template.sh optional -- Done - Randy
• Use uninative in new-sdk during setscene
• devtool in SDK needs fixing after toolchain changes
• Refactor to move functionality to SDK classes rather than meta-newsdk recipe
• Ensure we have bugzilla entries for additional major functionality