ensure there is a vivado project when calling read_ip, etc.

Change-Id: I44ff2e00f8242878763e20634c53afb054dc80ed
Floating point example to illustrate how to generate cores and import bvi wrappers

Change-Id: I3088bdb1d29123c2deb025c5df5585edebf0343c
fleshed out the BSV for the fp example

Change-Id: Ibb32203ea17c0961d2936cc08481ad52cb5781c5
had to hand-modify the generated import BVI, so committing it

Change-Id: Ie2fd342bff07cf5030fe30d4ce10d15810b0ec96
added missing indication to testfp.cpp

Change-Id: I42e7cab1a514a678c78a2fecd6ffd81b4e9e90f1
debugged for bluesim

Change-Id: I79481522a24061ac8c6275f2667c6b34bc611366