Add TestProcessAPI.py which exercises some Python SBProcess API. In particular, this tests

the SBProcess.ReadMemory() API, which, due to SWIG typemap'ing, expects 3 arguments (the location
to read from, the size in bytes to read, and an SBError object), and returns the result as a
Python string object.

On SnowLeopard where this has been tested, the SWIG script needs to be pampered (use the exact
same parameter names as in SBProcess.h) in order for this to work.

llvm-svn: 126736