[DynInst_API:] commit (v9.2.x): dataflow manual skeleton, new configuration options

[Bill Williams <bill@xxxxxxxxxxx>]

* New branch on git.dyninst.org: v9.2.x, for the upcoming release. These 
changes have gone there, but not to master yet.
* Skeleton for a dataflowAPI manual created.
* Configuration options added by request from Mark Krentel:
- BUILD_RTLIB (default ON): allows users who don't need the Dyninst 
runtime library to skip attempting to configure it. You can disable this 
if and only if you're not using the dyninstAPI component.
- BUILD_DOCS (default ON): allows users to skip rebuilding the manuals 
from LaTeX sources. You may disable this freely if you've obtained 
up-to-date manuals from elsewhere and are not contributing to the 
documentation.
--bw