Changes for version 0.15
- add B::PADLIST support and tests
- add typed padname tests
- replace EVALED with TYPED for PVMG. EVALED is only defined for rhs regexp.
- remove PADNAME, there is no such flag
- add NAMELIST for SVpad_NAMELIST with 5.20 only
- split AvFLAGS from SvFLAGS only where AvFLAGS are seperated (5.6 - 5.8)
- B::Flags - Friendlier flags for B