This commit fully changes the class name of "vector" to "pdvector".

This commit fully changes the class name of "vector" to "pdvector".

A nice upshot is the removal of a bunch of code previously under the flag
USE_STL_VECTOR, which is no longer necessary in many cases where a
functional difference between common/h/Vector.h and stl::vector was
causing a crash.

Generally speaking, Dyninst and Paradyn now use pdvector exclusively.
This commit DOES NOT cover the USE_STL_VECTOR flag, which will now
substitute stl::vector for BPatch_Vector only.  This is currently, to
the best of my knowledge, only used by DPCL.  This will be updated and
tested in a future commit.

The purpose of this, again, is to create a further semantic difference
between two functionally different classes (which both have the same
[nearly] interface).