pmt: added python converters
core: added tag to python converters
ctrlport: adding back old (almost) style API for controlport.

Allows us to create controlport interfaces from a name and object pointer and not just the alias of a gr_basic_block.
ctrlport: removed obsolete files.
ctrlport: fixing interface to rpcbasic_register_variable for new API to other functions.
build: disable certain Boost versions we know are buggy to fix Issue #513.

Creates a new list of version to test against. If any version matches the list of bad versions, set Boost to Not Found.
Merge branch 'maint'
Merge branch 'master' into next
Merge branch 'pmt_to_python'
Merge branch 'master' into next

Conflicts:
	gruel/src/python/CMakeLists.txt
gruel: fixing PMT naming issues with new PMT utilities.
build: generated headers naming issue fixed.
Merge branch 'next' of gnuradio.org:gnuradio into next