Update from version 1.4.0nb1 to 1.5.0.

Pkgsrc changes:
o Add patch-af and patch-ag so that the math library variant selection
  actually works as intended.

Upstream changes:

- Core
  + Removed several deprecated functions and features
  + Removed bsr, jsr, branch_cs, and ret opcodes
  + Removed global stacks system
  + Changed OPS file format to include explicit preamble
  + Changed all "new 'Iterator'" instructions into 'iter' instructions
  + Removed Configure.pl options for specifying non-working GC cores
  + Removed unexecuting code as found by Coverity
  + Improvements to the Parrot Debugger
  + Added experimental fixed-size structure allocator to the GC
  + Added experimental lazy arena allocation to the GC
  + Removed the defunct PASM1 compiler object
  + Refactored hashes, keys, and iterators
  + Added "corevm" make target to build Parrot without all the
    supporting libraries
  + Removed Random PMC type and added in a "rand" dynop
  + Optimization and Improvements to the NCI thunk generator
  + New include file libpaths.pasm
- Compilers
  + Multiple .local with same name and different type is now an
    error on IMCC.
- Platforms
  + Improved support for detecting Fink and Macports
  + Updated search directories for libraries
- Documentation
  + "Parrot Developers Guide: PIR" released to publisher and
    available to purchase
  + Improved documentation about Parrot Debugger
  + Update PGE Documentation
- Miscellaneous
  + Added tests
  + Fixes to code, documentation, and standards

(he)